Hard Disk Wiki

Seagate hard disk is a product of Seagate Corporation and is a representative work of Seagate.

Seagate Hard Disk Introduce

Seagate is the first company to bring to market technologies such as vertical recording, hardware-based full disk encryption, and hybrid hard disks that enable you to have a digital life - whether from your home, handheld device, car, or office.
Continually invest in the development of new technologies to improve performance, speed, and area density (the ability to store more data in less space).
As digital content, such as music, videos, photos, and games, has increasingly entered People's Daily lives, static data storage is becoming obsolete. In today's on-demand world, access, share and protect your digital content with dynamic storage solutions that give you the freedom to work, create and interact anytime, anywhere.

When the first hard disks started shipping in 1956, only big companies could afford the expense and space required for these one-ton behemoths. Today, digital storage is everywhere. Whether you realize it or not, you probably deal with digital storage devices every day. Every time you go to your bank ATM, record and play your favorite TV show on your DVR, or download a song to your portable media player, you are accessing or storing information from your hard disk. Every day, content passes through a variety of storage devices before reaching your office computer or personal media player. Today's hard disks are used not only for storing content, but also for transferring and creating content. With the rise of downloads and instant access, you'll find an infinite amount of content to download, enjoy and share, anytime, anywhere.
The market for digital storage is growing rapidly, spurred by an explosion of content created and used, as well as new legislation requiring companies to store certain records and information. Today's storage solutions not only ensure the security of valuable data, but also help you achieve flexible access to information and media according to your needs. Access and get content from wherever you are, whether in your car, on a business trip, or at the gym. From home entertainment consumer electronics devices to large enterprise data centers, Seagate's digital storage solutions enable you to get the most out of your content, whether for work or play.

As an industry expert for 30 years, Seagate continues to lead the storage industry in innovative solutions. No hard disk vendor today can match Seagate's broad range of solutions. With a wide range of products ranging from home computing to enterprise data centers, Seagate offers advanced solutions for every industry requiring digital storage. The company is an industry leader in research and development and is committed to introducing new technologies that meet the needs of future development. From the beginning, Seagate has continued to create breakthrough innovations to solve the challenges of digital storage solutions. Seagate was the first company to bring to market technologies such as vertical recording, hardware-based full disk encryption and hybrid hard disks that enable you to have a digital life - whether from your home, handheld device, car, or office - and is constantly investing in the development of new technologies to improve performance, speed, and area density (the ability to store more data in less space).

Consumer solutions

Today's on-demand world demands more computing performance, mobility, and reliability than ever before. Seagate offers award-winning products for desktops and high-end PCS, as well as laptops and mobile computing devices.
With the acquisition of Maxtor, Seagate also offers the broadest range of retail-branded storage solutions for small businesses, homes and home offices, including the FreeAgent, BlackArmor, Maxtor OneTouch and CentralAxis families. From portable and one-click backup portable hard disks to personal servers and network storage solutions, Seagate enables you to make the most of your corporate and personal content in the office, at home or on the go.
Seagate has always been at the center of the consumer electronics revolution. As a leading supplier of hard disks to the CE market, Seagate offers storage solutions specifically designed to meet the needs of many increasingly complex CE applications. Whether it's advanced game consoles, digital cameras, portable media players or automotive GPS systems, Seagate drives help CE manufacturers develop the next generation of devices for today's consumers.

Enterprise application

Enterprise-level applications are the backbone of the world's data storage. Today's companies require the ability to reliably store, manage, and protect large amounts of information. With a wide range of products optimized for rapidly growing enterprise applications, Seagate is a leader in providing innovative enterprise storage solutions. Seagate drives enable better, faster and more reliable cooling of business-critical storage systems, helping companies reduce costs and improve efficiency.

As an industry leader, Seagate is committed to providing technologies that improve company efficiency, such as platformization and vertical integration, to give companies a competitive advantage. Platformization helps Seagate provide a comprehensive product portfolio, allowing the company to apply one core technology platform to produce multiple products. Seagate applied the platformization concept to the manufacturing process, enabling Seagate to manufacture different specifications of hard disk products on the same production line, further improving efficiency, product quality and profit. Vertical integration technology has also played a huge role in simplifying the design and development process. Seagate designs, owns and manufactures all the core technologies needed to develop personal storage products, including magnetic heads, media, motors and printed circuit boards. The company does not rely on third parties to supply components and has full control over the entire development process and product roadmap, from component supply to technical improvement. As a result, product quality, profitability and time-to-market have improved dramatically, enabling Seagate to quickly meet customer requirements for quality, reliability and supply.

Seagate Technologies has been a leader in the storage industry for 30 years. Headquartered in Scotts Valley, California, Seagate employs more than 55,000 people worldwide who are dedicated to developing the company's next generation of storage products. From the original 5.25-inch hard disks for PCS to the development of vertical recording technology, the company pioneered new industry standards that greatly facilitated the advancement of the digital information age. Through technology leadership and innovation, Seagate continues to help individuals and companies maximize their use of digital content in an ever-evolving, on-demand world.

Seagate was founded in 1979 as a manufacturer of hard disks

In 1980 Seagate produced the industry's first 5.25-inch hard disk
In 1989, Seagate acquired Imprimis Technologies - High Capacity Hard Drives and Components
In November 1992, Seagate introduced the first 7200 RPM hard disk
In November 1992, Seagate introduced vibration sensing technology to the 2.5-inch hard disk and was the first to market
In May 1993, Seagate shipped its 50 millionth hard disk
In February 1996, Seagate merged with Conner Peripherals to form the world's largest independent storage equipment manufacturer
In October 1996, Seagate introduced the first 10,000 RPM hard disk, the Jaguar Series
Seagate introduced the first 7200 RPM Ultra ATA hard disk for desktop computers in October 1997
In October 1997, Seagate introduced the world's first Fibre Channel interface hard disk
In March 1998 Seagate produced 1 billion recording heads
In April 1999, Seagate shipped its 250 millionth hard disk
January 2000 DISHPlayer 500 integrated Seagate Hard drives - Seagate became the world's largest supplier of digital video recorders and user data storage
In February 2000, Seagate introduced the world's first 15,000 RPM hard disk, the Jaguar X15
In November 2000, Seagate introduced the world's largest hard disk, the Coolfish 180-gigabyte hard disk
The second generation Jaguar X15 was introduced in March 2001 - a year earlier than its competitors
In October 2001, Microsoft launched the Xbox with Seagate hard disks
In May 2002, Seagate introduced the Jaguar 15K.3 - its third-generation 15,000rpm hard disk - a year ahead of its competitors
August 2002 Seagate successfully introduced HAMR technology - HAMR is designed to increase the density of the storage surface by more than 100 times
In November 2002, Seagate demonstrated vertical recording technology, achieving a storage surface density of 100 billion gigabits per square inch
November 2002 Seagate delivers the industry's first Serial ATA hard disk, the Coolfish ATA V
December 2002 Seagate re-became a public company (NYSE:STX)
In June 2003, Seagate entered the notebook hard disk market with Momentus 2.5-inch hard disks
In February 2004, Seagate announced the industry's first 2.5-inch enterprise hard disk, the Savvio
In June 2004, Seagate introduced 12 new products - an industry first for a wide range of applications, such as MP3, DVR, consumer electronics, notebook computers, PCS, servers and enterprise data centers
In February 2005, PC World named the Seagate Barracuda 7200 the best hard disk
In March 2005 Seagate delivered 10 million 15K RPM hard disks
In May 2005, Seagate was awarded the Women's Employment Promotion Enterprise
June 2005 Seagate is at it again: introducing 10 pioneering and innovative hard disk products, including the first 2.5-inch hard disk with vertical recording technology and the first hard disk with full disk encryption to provide strong data security
In August 2005, VarBusiness magazine awarded Seagate the "Company of the Year" and "Best Product Innovation" awards
Mirra was acquired by Seagate in September 2005
January 2006 Seagate was named "2006 Company of the Year" by Forbes
The world's first 750G hard disk was introduced in April 2006
In May 2006, Seagate acquired Maxtor
In March 2007, Seagate introduced the world's first full disk encrypted hard disk for a laptop
In October 2007, Seagate shipped the world's first hybrid hard disk
In March 2007, Seagate acquired Evault
Seagate acquired MetaLINCS in March 2008
Seagate shipped one billion hard disks in April 2008
In July 2008, Seagate shipped the world's first 1.5TB hard disk
In March 2013, Seagate introduced its new generation of Seagate Backup Plus FAST high-speed portable hard disks. With a capacity of up to 4TB, it is the world's largest 2.5-inch portable hard disk.

Each manufacturer has its own set of rules, you can hardly remember so much, write commonly used good, such as Seagate hard disk "ST" after the first number is the first part of the appearance of the hard disk, Seagate hard disk shape code are 1, 3, 4, 5, 9 five. Among them, 1 represents a 3.5-inch full-height hard disk with a thickness of 41mm, and 3 represents a 3.5-inch half-height hard disk with a thickness of 25mm, which is also the most mainstream product at present. 4 indicates a 5.25-inch hard disk with a thickness of 82mm, 5 indicates a 3.5-inch hard disk with a thickness of 19mm, and 9 indicates a 2.5-inch half-height hard disk.

The second part of the number after "ST" is two to three digits, which represents the capacity of the hard disk, the unit is G, such as 160, indicating 160G, if it is only two digits, such as 80, it represents 80G.
The third part of the number after "ST" is a number, representing the capacity of the hard disk cache, 7200.11 in the hard disk, this 3 means 32M, 6 means 16M, 8 means 8M, but in other series, it is also useful to use the power of 2 to indicate the size of the cache, such as 3 is 2 to the power of 8M, 4 means 16M, 5 means 32M, 7200.12 series ST3500418AS is this representation, the cache is 16M;

The fourth part after the "ST" is two digits (in rare cases, three digits), and usually the first digit represents the number of hard disks. The second (or last two) digits are reserved.The last part of the model is A letter, usually one or two, representing the interface type of the hard disk, where "A" represents the interface of the ATA UDMA/33 or UDMA/66 IDE, and "AS"/" SV "represents the interface of the Serial ATA150/300. "AG" represents the interface of the ATA for notebook computers, "LW" represents the interface of the 68-pin Ultra-2 SCSI(LVD), and "LC" represents the interface of the 80-pin Ultra-2 SCSI(LVD).
With Seagate Coolfish 7200.10 160Gbytes ST3160215A, it means that Seagate Coolfish series 10 generation 7200rpm 160G hard disk, ST3160215A, ST means Seagate, 3 means it is a 3.5 inch half high hard disk, 160 represents 160G, and 2 represents the cache 2M. 15 means it uses A platter (160G), and A means it uses an ATA interface.

Western Digital Hard disks

The Western Digital hard disk (WD) is a hard disk manufactured by Western Digital Corporation. Western Digital Corp is the world's leading hard disk manufacturer. The company was founded in 1970 and began designing and producing hard disks in 1988. Headquartered in Lake Forest, California, USA, it is one of the oldest hard disk manufacturers and one of the founders of IDE interfaces. WD employs approximately 23,000 people worldwide.

Western digital company

The company has manufacturing facilities in Malaysia, California, and Thailand, design facilities in southern and northern California, and operations worldwide. After exiting the SCSI market in 1999, WD focused on the IDE segment, with sales of $1.015 billion in the second half of 2001 and a profit of $33 million. WD company is not good at publicity company, let people can remember the unique technology is few, in fact, WD's technical strength is not to be underestimated, its hard disk performance at a high level for a long time must have advanced technology support. Western Digital has long been committed to providing complete storage solutions for personal computer users around the world, and Western Digital has rich experience in serving users and organizations that collect, manage and use digital information. Western Digital's product line covers enterprise servers, desktop IDE hard disks, mobile storage applications and AV.

Hard disk brand

WD Raptor and WD Caviar Caviar are registered trademarks. WD Passport, WD Scorpio and WD Logo are Western Digital Technologies, Inc. The trademark of... All other brand and product names mentioned herein are the property of their respective companies.

Product classification

enterprise-class

【WD Raptor 】 SCSI interface for advanced workstation and server markets. It offers an average of 1.2 million hours of trouble-free time and a 5-year warranty.

Desktop level

(Desktop hard disk) : [WD Raptor X] 10 thousand RPM hard disk with SATA interface 150 GB, 1.5 Gb/s, 16 MB cache, 10,000 RPM. Five years warranty. Caviar(Caviar) series [WD Caviar SE16] run fast and quiet, low heat, with 16 MB cache, support NCQ, support hot swap, support 3G/s transmission rate, in line with REV.2.5 specifications. 【 WD Caviar GP】 (Green power) hard disks make desktop PCS and external storage devices run quieter and generate less heat. This device can save important power resources. 【WD Caviar SE】 The hard disk runs quietly, fast, low heat, equipped with 8MB cache, showing superior performance and reliability SATA interface to 2TB GB, 3Gb/SEC, 8MB cache, 7200 RPM. 【 WD Caviar 】 The Western Digital Caviar hard disk is the best choice for mainstream desktop personal computers with a maximum capacity of 2TBG.

Portable hard disk

WD Scorpio drives are characterized by high performance and low power consumption. The 5 400 RPM WD Scorpio is extremely fast but consumes very little power, extending system battery life and increasing long-term reliability. WD entered the mobile hard disk market in 2005.

Digital video

WD AV series drives are widely used in security audio products, including set-top boxes, DVD players and mainstream surveillance system equipment. Capacities range from 80GB to 720GB using EIDE and SATA interfaces.

Color classification

Blue represents mainstream hard disk products. The sense of stability conferred by BLUE represents the professionalism and reliability of Western Digital Blue. Caviar Blue(Western number Caviar) and Scorpio Blue(Scorpion to special) are the most commonly used series of 3.5-inch and 2.5-inch products, respectively. This series of hard disks can meet the harsh requirements of ordinary users for hard disk stability.
Blue disk 7200 RPM, all aspects are more balanced, the performance measured down and the black disk is similar, do system disk and store the game is good. 3 years guarantee. Common models are: WD1600AAJS, WD5000AAKS, WD10EALS, WD10EALX, WD3200BEVT, etc.
Green represents environmentally friendly hard disk products. Green represents the energy saving and environmental protection hard disk in the 3.5-inch WD Caviar series with its fresh and environmental protection meaning. WD Green Drives with WD GreenPower technology provide a quieter, environmentally friendly and low-power storage solution for energy-conscious consumers.
Green disk 5400 RPM, low noise and energy saving, the disadvantage is poor performance. It is suitable for making warehouse inventory of movies and materials. 3 years guarantee. Common models are: WD5000AADS, WD10EADS, WD10EADX, WD10EARS, WD10EVDS, etc.
Black represents the highest performance product. Black gives Western Digital hard disk the ultimate performance because of its professional top-level implication and speed sense. The rock-solid mechanical structure provides the perfect storage solution for professional enthusiasts and those looking for extreme performance.
Black disk 7200 RPM, the cache can be used to download disks and system disks, often read and write program files. 5 years guarantee. Common models: WD5001AALS, WD1001FALS, WD1002FAEX, WD2001FASS, WD3200BEKT, etc.
Red disk: The red disk is located in the home, small office NAS, with the ability to work 7×24. The power consumption and noise are comparable to the green disk, but the reliability and stability are far better than the green disk.
The latest release of purple disk: Purple disk is specifically for video surveillance applications, after a special monitoring compatibility test (including CCT certification), can 24×7 uninterrupted operation, the average time between failures of 1 million hours, suitable for home, SOHO, small and medium-sized enterprises. It supports up to eight hard disks in parallel, supports access to up to 32 high-definition cameras, annual write load of 60TB, and typical power consumption of 5.1W.

Hard disk number

Western Digital's IDE drives include the Caviar (Caviar) and Experl (Expert) series, though the latter has long since been discontinued. WD hard disks are basically divided into three categories: high-end BB series, mid-end AB series, low-end EB series, of which only BB series hard disks are 7200 RPM products. The number of Western digital hard disks usually consists of a main number and an additional number, but Western Digital does not disclose the specific meaning of the additional number to the retail market.
The numbering format of Western Digital varies according to the product series, and the numbering method is simple and clear, consisting of 12 numbers or letters. In the 12 numbers, the first 6 numbers are the main numbers, and the last 6 numbers are additional numbers. The main series of caviar in the desktop market is labeled as "manufacturer code + capacity + speed, cache + interface type".

Principal number part

WD - XXXX - X - X
The first part "WD" is short for "Western Digital" and refers to the products of Western Digital Corporation.
The second part usually consists of 3 or 4 digits, indicating the capacity, and is measured in 100M. The logo is the same as Seagate's, with the 4-bit "1200" representing 120GB and the 3-bit "800" representing 80GB
The letters in the third part indicate speed and cache capacity. A indicates a caviar hard disk whose rotational speed is 5400 RPM/ min. "B" indicates a caviar hard disk whose speed is 7200 RPM/ min. E indicates the Protege series hard disks whose rotational speed is 5400 RPM/ min. "J" represents a high-end caviar hard disk with a speed of 7200 RPM/ min and a data cache of 8MB. "G" represents the most high-end desktop hard disk Raptor series with a speed of 10,000 RPM/ min and a data cache of 8MB.
The fourth part describes the interface types. A- Ultra ATA66, B- Ultra ATA100, W represents the hard disk used in the AV (digital video and audio) field, D represents the Serial ATA150 interface.

Additional numbered part

- X - X - XX XX
The first part is the OEM customer identification, 00 is the retail market, and the rest is the OEM customer code. If it is other characters, it is the OEM customer code, different numbers correspond to different OEM customers, and this number is usually not for the retail market.
The first character in the second part indicates the capacity of a single disk. C indicates that the capacity of a single disk is 40GB, D indicates 66GB, and E indicates 83GB. Corresponding to the single disk capacity, CP--Protg series (commonly referred to as EB series) 40GB single disk capacity version, CB--Caviar5400 series (AB series) 40GB single disk capacity version, CA--Caviar7200 series (BB series) 40GB single disk capacity version, CR- Caviar SE 7200 series (i.e. JB series with 8MB cache) 40GB single-disk capacity version.
The last character in the second part indicates the version code of the same series of hard disks, which changes with different series. "A" stands for 7200 RPM, BB series with Ultra ATA100 interface; "B" stands for 5400 RPM, Ultra ATA66 interface AB series; "P" stands for 5400 RPM, EB series with Ultra ATA100 interface; "R" stands for 7200 RPM, Ultra ATA100 interface, JB series with 8MB cache. In the single disc 66GB and 83GB products, there are also other letters such as "U", "V", corresponding to JB series and BB series products respectively.
The fourth part is the Firmware version of the hard disk. We commonly have "F0", "A0" and so on.

Over time, the hard disk capacity on your computer may become insufficient. If you find yourself needing more storage space, there are several ways to increase your computer's hard disk capacity. The following is a guide to computer storage expansion that will introduce you to several common methods.

1. Install an internal hard disk: This is one of the most affordable ways to increase your hard disk capacity by installing additional internal hard disks. You need to determine if your computer has available hard disk slots and purchase the right hard disk. Then you need to turn on the computer, insert the hard disk into the appropriate slot, and connect the appropriate data and power cables.

After the installation is complete, you can partition the new hard disk and use it as additional storage space.

2. Use an external hard disk: If you want to increase storage space without changing the internal hardware of your computer, using an external hard disk is a good choice. The external hard disk can be connected to the computer via USB, Thunderbolt, or eSATA ports.

You can choose to buy a ready-made external hard disk, or buy a hard disk case and a separate hard disk, and then install it in the hard disk case. External hard disks are very convenient to use and can be easily connected and disconnected.

3. Use Network storage devices: Network storage devices (NAS) are another common way to increase storage space.

A NAS is an external device that usually has a large storage capacity and can be connected to your computer over a network. By using NAS, you can share files between multiple devices and access your files through cloud storage. While NAS may require some additional setup and installation process, it provides a flexible solution to easily share and access files between different devices.

4. Cloud storage services: If your storage needs are small, you can consider using cloud storage services. Cloud storage is an online storage solution where you can upload files to the cloud and access them over the network. Many companies offer cloud storage services, and you can choose one that suits your needs.

Cloud storage can not only provide you with additional storage space, but also help you back up and protect important files. When choosing a storage expansion method, it is important to consider the following factors: price, installation and setup complexity, portability, and the need for storage performance. You can choose the method that works best for you according to your budget and needs, and meet your storage needs by increasing the capacity of your hard disk.

External hard disks come in various capacities, ranging from 500GB to 2TB, and even 1TB. They provide additional storage space to meet your growing data needs. The external hard disk price varies depending on factors such as storage size and brand.

The external hard drive offers portability and ease of use, allowing you to transfer and store files conveniently. Whether you need a 1TB external hard disk for large media collections or a 500GB option for basic storage, there's a suitable option available.

External SSDs, specifically designed for laptops, offer faster data transfer speeds and durability. They are ideal for users who require quick access to their files. External storage devices provide a flexible and reliable way to expand your computer's storage capacity.

With a wide range of options in the market, you can choose the external storage device that best fits your requirements and budget. Whether it's for backing up important data, carrying your work files, or storing your favorite media, these devices offer the convenience and peace of mind you need. Browse through the different offerings and find the perfect external storage solution for your laptop or desktop.

Which is better, 1tb SSD or 2tb SSD

Choosing a 1TB or 2TB SSD depends on individual needs and budget. Here are the pros and cons of 1TB versus 2TB SSDS:

1TB solid state drive. It may be sufficient for the average user or for limited storage needs, but there is still plenty of room to install the operating system and some large software. For older computer upgrades, 1TB SATA SSDS are a cost-effective option, as older computers usually only support SATA interfaces and do not have to invest too much in SSDS.
2TB solid state drive. It offers a larger storage capacity and is ideal for users who require a large amount of storage space, such as storing a large number of files, media content, or frequent data backups. For applications that involve a lot of data, such as video editing, gaming, etc., 2TB May be more suitable. And the price of 2TB SSD has been quite close to the people, is a very cost-effective choice.

Adding hard disk can easily increase the storage capacity of the computer, improve the performance and efficiency of the computer, and do not need to reinstall the system and software, and the cost is lower.

First, the benefits of hard disk
With the increasing popularity of computer applications and the strengthening of the trend of computer entertainment, people's storage demand is also increasing. Adding a hard disk can easily increase the storage capacity of the computer, allowing users to easily store more files, programs and multimedia content, improving the performance and efficiency of the computer. Adding a hard disk can also improve the computer's response speed and speed up the running of programs, allowing users to start programs and execute commands faster. In addition, adding hard disk can also reduce the crash and error of the computer system, improve the stability and reliability of the computer, and facilitate the user's data backup and recovery. Therefore, adding a hard disk is a very convenient and practical way to upgrade a computer.
2. Comparison between adding hard disk and replacing hard disk
Compared with replacing a hard disk, the advantage of adding a hard disk is that you do not need to reinstall the system and software, and you can easily increase the storage capacity on your computer. In addition, the cost of adding hard disks is lower, and users only need to buy a hard disk and a hard disk box to expand, without the need to buy the entire computer system. However, adding a hard disk also has some limitations and disadvantages, for example, some laptops and some computers with small chassis cannot connect to an external hard disk box, and can only use the internal hard disk for expansion. Adding a hard disk also requires attention to the type and capacity of the hard disk after expansion, and some computer systems may be limited by hardware capacity. Replacing a hard disk requires a new installation of the system and software, and the performance of the computer is more significant, but the cost is higher, requiring the purchase of a larger and faster hard disk than the existing hard disk and reinstall the system and software.

external ssd hard drive has a variety of types such as solid state hard drive, mechanical hard drive and game hard drive, respectively with high-speed, seismic, large capacity, low price and other characteristics, you can choose the right model according to demand and budget. Solid state drives are good for transferring large amounts of data, mechanical drives are good for storing large amounts of files, and gaming drives are designed for gamers.
An portable hard drive is a portable storage device that allows you to easily transfer and back up data between different computers or devices. There are many types of portable hard drives, and according to your needs and budget, you can choose the portable hard drive that is right for you. This article will look at three common types of portable hard drives: solid state drives, mechanical drives, and gaming drives, and give some recommended brands and models.

Solid-state drives (SSDS) are high-speed, lightweight, earthquake-resistant mobile hard drives that have no mechanical parts, making them faster to read and write, and more durable. SSDS are suitable for users who need to transfer large amounts of data quickly or run complex programs, such as video editors, designers, programmers, etc. At present, there are many brands of solid state drives on the market, such as Samsung, Sandisk, Inrui and so on. Among them, the Samsung T3 series is a high-performance, compact SSD that supports USB 3.1 interface and can hold up to 2TB. SanDisk also has a Portable SSD, the SanDisk Portable External SSD, which also supports a USB 3.1 interface and has a maximum capacity of 2TB. The price of these two solid-state drives is about 800 yuan, which is relatively cost-effective.

A mechanical hard drive (HDD) is a high-capacity, low-cost portable hard drive with a rotating disk and magnetic head that makes reading and writing slower and more susceptible to vibration and temperature. However, the advantages of mechanical hard disks are large capacity and low price. Mechanical hard disks are suitable for users who need to store a large number of files or data, such as video enthusiasts, students, office workers, etc. At present, there are many brands of mechanical hard disks on the market, such as Western Digital, Seagate, Toshiba and so on. Among them, Western Digital's My Passport series is an encrypted portable hard drive that supports USB 3.0 ports and can hold up to 5TB. Seagate also has an External Hard Drive, Seagate External Hard Drive, which also supports USB 3.0 and has a maximum capacity of 5TB. The price of these two mechanical hard disks is about 400 yuan, which is very affordable.

Game Drive is a portable hard drive designed specifically for gaming, which can meet the needs of gamers for storage space and read and write speed. Gaming hard drives are usually compatible with certain gaming platforms or consoles, such as Xbox, PlayStation, etc. Gaming hard drives are suitable for those who like to play a variety of games, such as FPS, RPG, MOBA, etc. There is currently a gaming Hard Drive designed specifically for the Xbox, the Seagate Game Hard Drive, which supports a USB 3.0 port and has a maximum capacity of 4TB. This gaming hard drive costs around $600 and allows you to easily store and run games on your Xbox.

It is a portable storage device that uses a hard disk as a storage medium to facilitate the exchange of large-capacity data between computers. The device is designed to emphasize portability, making it ideal for situations where you need to carry large amounts of data around with you. There are two main types of mobile hard drives: mobile solid state drives (SSDS) and mobile mechanical hard drives (HDDS). Mechanical hard drives are generally more cost-effective and relatively inexpensive, while solid state drives offer faster transfer speeds and are suitable for users who need to transfer data quickly, especially when working away from home.

The components of a mobile solid-state drive usually include a main controller, a memory unit, and a bridge chip. The housing is generally made of metal, which not only helps to dissipate heat, but also provides protection against pressure and shock. When the hard drive is connected to a computer or phone, an indicator will light up, indicating that the hard drive is working. In terms of interface, the common USB 2.0/3.0 type, and more high-end products may be equipped with USB 3.2Gen 2x2 interface, which means that the portable hard disk transmission speed of this interface can reach 2000MB/s, which means that several GB of video files can be transferred in a few seconds.

Mobile hard disk, mainly refers to the use of USB or IEEE1394 interface, can be plugged in or unplugged at any time, small and easy to carry hard disk memory, at a high speed and the system for data transmission. On products with USB1.1 interface specifications, it takes a long time to transfer a large amount of data. The USB2.0, IEEE1394, cSATA mobile hard disk interface is relatively much better. USB 2.0 interface transmission rate is 60MB/s, USB 3.0 interface transmission rate is 625 MB/s, IEEE 1394 interface transmission rate is 50 to 100 MB/s. Advantages of mobile hard disk: large capacity; Good compatibility, plug and play; High speed; Small size, small mass; Safe and reliable.
The mobile hard disk is mainly composed of a shell, a circuit board (including a control chip and data and power interfaces) and a hard disk. The shell is generally aluminum alloy or plastic material, which plays the role of anti-pressure, anti-seismic, anti-static, anti-fall, moisture-proof, heat dissipation, etc. The control chip controls the read/write performance of the mobile hard disk; Common data interface is USB and IEEE1394 two kinds; Taking into account the size, shock resistance, power consumption, energy saving and other aspects, usually choose 2.5-inch notebook hard disk.

Large capacity

Mobile hard disk can provide a considerable storage capacity, is a more cost-effective mobile storage products. Portable hard disk can provide users with large storage capacity and good portability at an acceptable price range. At present, the mobile hard drives on the market can provide 320GB, 500GB, 600G, 640GB, 900GB, 1000GB(1TB), 1.5TB, 2TB, 2.5TB, 3TB, 3.5TB, 4TB and other capacities, up to 12TB capacity, to a certain extent to meet the needs of users. With the development of technology, the capacity of mobile hard disk will be larger and larger, and the volume will be smaller and smaller.

Small size

Most of the mobile hard disks use USB and IEEE1394 interfaces, which can provide higher data transmission speed. However, the data transmission speed of the mobile hard disk is limited to a certain extent by the interface speed, especially in the USB1.1 interface specification products, when transferring a large amount of data, it will test the patience of the user. USB2.0 and IEEE1394 interfaces are much better.

Fast speed

Most of the mobile hard disks use USB, IEEE1394, eSATA interfaces, which can provide a high data transmission rate. However, the data transmission rate of the mobile hard disk is limited by the interface speed to a certain extent, especially on the products of the USBl.1 interface specification, which will test the patience of the user when transferring large data. The USB2.0, IEEE1394, eSATA interfaces are much better. USB2.0 interface transmission rate is 60MB/s, IEEE 1394 interface transmission rate is 50 ~ 100MB/s, and eSATA, when exchanging data with the host, read a gigabyte order of large files in a few minutes, especially suitable for video and audio data storage and exchange.

Easy to use

Now the PC is basically equipped with USB function, the motherboard can usually provide 2~8 USB ports, some displays will also provide USB adapters, USB interface has become a necessary interface in personal computers. USB devices can be used in most versions of WINDOWS operating systems without the need to install drivers, with a true "plug and play" feature, flexible and easy to use.

Safe and reliable

Data security has always been the most concerned issue of mobile storage users, and it is also an important standard for people to measure the performance of such products. Mobile hard disk has won the favor of many users with the advantages of high speed, large capacity, lightweight and convenient, and the greater advantage is the security and reliability of its stored data. This kind of hard disk is similar to the structure of the laptop hard disk and uses silicon disk. This is a more durable platter material than aluminum and magnetic, and has greater storage capacity and better reliability, improving data integrity. The use of silicon as a material disk drive, featuring a smoother disk surface, effectively reduces the number of irregular disks that may affect the reliability and integrity of the data, and the higher disk hardness makes the USB hard disk have high reliability.

Matters needing attention

The use of mobile hard disk should pay attention to the following problems:
1, do not use for a long time. Use a mobile hard disk with general materials, it is best not to plug in the computer for long-term work, mobile hard disk is used for temporary exchange or storage of data, not a local hard disk. Compared with the internal hard disk will work in a harsh environment at all times, the working time should be shortened as much as possible.
2. Do not defragment the disk. Do not defragment the removable hard disk, otherwise it will easily damage the hard disk. If you really need to organize, the method can be used to copy the data in the entire partition, and then copy back.
3, do not mix the power supply line. Do not mix the power cables. Because the power cables of the mobile hard disk box are dedicated, the voltage of the power cable interface may be different. If you insert them improperly, the box will be burned, and the hard disk will be burned.
4. Don't beat. Don't beat, take lightly; Pay attention to the temperature, do not overheat; Dry and waterproof, pull back first.
5, do not implement hot swap in the transmission process to prevent electromagnetic, dust, water and other external interference.

Product selection

1, mobile hard disk shell: mobile hard disk shell material is generally divided into metal and plastic two kinds. Generally speaking, the metal shell has better compression and heat dissipation performance, while the plastic shell has relatively more advantages in terms of shock resistance and weight .
2, PCB board control chip: the control chip on the mobile hard disk PCB is directly related to the read and write performance and stability of the product. At present, the control chip is mainly divided into high and low two grades. The representative of the high-end control chip is the plath CypressISD300A1 / CY7C68300B CY7C68300C, NECLiPD720133, prosperous nine PL - 3507. The characteristics of these chips: the price is more expensive, stability and compatibility are very good, is the first choice of high-end users. Representatives of low-end control chips are Anguo AU6390, Yangzhi ALi M5642, Skyworth CL811 series and so on. The characteristics of these chips are: stability and data transmission performance is relatively poor, but enough to meet the daily work needs, because of its low price, mostly used in low-end hard disk boxes .
3, hard disk box external interface: at present, the mainstream interface of mobile hard disk is high-speed USB2.0 and LiSB3.0 high-end products can see IEEE1394 or eSATA interface, IEEE1394 interface is divided into IEEE1394a and IEEE1394b two kinds: The IEEE1394a interface data transmission rate can theoretically reach 400Mbit/s(50MB/s). The IEEE1394h interface supports a transfer rate of 800Mbit/s(lOOMB/s). SATA can theoretically reach 3Cbit/s, which is the development direction of mobile hard disks in the future .
4. Quality: There are many so-called brand mobile hard disk on the market is actually assembled by the dealer, that is to say, the manufacturer provides the dealer with only the mobile hard disk box, the dealer gets the box and then put the hard disk into the quality of this brand mobile hard disk can not be guaranteed. Parallel hard disks or even repaired hard disks are likely to be put into mobile hard disk boxes and sold to unwitting consumers. When purchasing such products, please recognize the product's trademark, anti-counterfeiting logo, and ask the dealer for an official invoice and three-pack card. Avoid buying fake goods, invoices and three-pack cards are the proof of after-sales service in the future

Technical parameter

speed

Speed is an important indicator to measure the performance of mobile hard disk, which mainly depends on the data transmission rate and speed of the hard disk.

1. Data transmission rate
The data transmission rate of a hard disk emphasizes the internal transmission rate (the data transmission rate between the hard disk head and the cache), while the mobile hard disk refers more to the data transmission rate of its interface. Because the mobile hard disk is connected to the system through an external interface, the speed of its interface limits the data transmission rate of the mobile hard disk. Although the current USB1.1 interface can provide 12 Mbps; USB 2.0 interface can provide 480 Mbps; IEEE 1394a interface can provide 400 Mbp; IEEE 1394b can provide a data transmission rate of 800 Mbps, but in practical applications will be due to some objective reasons (such as storage devices used in the main control chip, circuit board production quality is good, etc.), slowed down the transmission rate in the application.
2. Speed
The speed of the ordinary hard disk in the home is generally 5400pm, 7200 rpm, etc., and the high speed hard disk is now the first choice for desktop users; For notebook users, 4200 rpm and 5400 rpm are the main, although some companies have released 7200rpm notebook hard drives, but it is still relatively rare in the market.
Mainstream 2.5-inch brand portable hard drives have read speeds of about 15-25MB/s and write speeds of about 8-15MB/s. It takes about 6 minutes and 40 seconds to copy a 4GB DVD movie to a portable hard drive at a write speed of 10MB/s. It takes about 3 minutes and 20 seconds to copy a 4GB DVD movie from a portable hard drive at a reading speed of 20MB/s

Power supply

For laptops, when the 2.5-inch USB mobile hard drive works, the hard drive and data interface are powered by the USB interface. The USB interface can provide 0.5A current, and the working current of the laptop hard disk is 0.7 ~ 1A, and the general data copy will not be a problem. However, if the hard disk capacity is large or the mobile file is large, it is easy to have insufficient power supply, and if the USB port supplies power to multiple USB devices at the same time, it is also easy to have insufficient power supply, resulting in data loss or even hard disk damage. To enhance power supply, a 2.5-inch USB portable hard drive usually provides a power cable that takes power from the PS/2 port or usb port. When moving the hard disk to move large files, etc., you need to connect the PS/2 power supply cord. 3.5-inch mobile hard drives generally come with external power supplies, so there is basically no problem with power supply. IEEE1394 interface can provide up to 1.5A current, so no external power supply is required).
Tip: In terms of power issues, in general, a usb port power supply is sufficient. However, it is possible to encounter the need to connect two interfaces at the same time, so the user is best to buy a data cable with two USB interfaces when purchasing, to avoid the situation of insufficient power supply

dimension

At present, mobile hard drives can be divided into three types by size: 3.5-inch desktop hard drives; 2.5-inch laptop hard drive; 1.8-inch micro hard disk. Among them, the 3.5-inch desktop hard disk has the advantages of fast speed and large capacity, but it is large, heavy and inconvenient to carry, and because the hard disk is designed for the desktop, the shockproof performance is poor, but there are still certain advantages in terms of price and capacity. 2.5-inch notebook hard disk is specially designed for the notebook, the size and weight are smaller. There is also a special design in shock resistance, good shock resistance, the most used in the current mobile hard disk. 1.8 inch micro hard disk, also designed for notebooks, good seismic performance, and size, weight is also the smallest of the three, but its price is higher, the capacity is smaller, more difficult to popularize, more suitable for special needs users.

capacity

Capacity is the storage space of the mobile hard drive. In 2006, the mainstream hard drive capacity was increased from 160GB to larger capacity. At present, the 250G and 320G products are quite cost-effective. The world's largest single disk capacity reached 750G, 320G product market has been quite mature, the price is also very reasonable. And 400G or above products are still a high-priced series, ordinary users rarely consider. Although 160G and 250G are the mainstream capacity, but limited to cost and actual use needs, for general office and home applications, the choice of 80G or even lower 40G has been fully able to meet the needs.

port

The interface type refers to the type of interface used by the mobile hard disk to connect to the computer system, rather than the interface type of its internal hard disk. Because the mobile hard disk can be connected to the system through the interface, the interface determines the performance and data transmission speed of the connection with the system. At present, the common data interfaces of mobile hard drives are USB and IEEE1394. USB is the mainstream interface of mobile hard disk at present, and it is also the interface of almost all computers, with the advantages of hot swappable, unified standards, and multiple external devices. There are two USB standards: USB1.1 and USB2.0. The USB2.0 transfer speed is up to 480Mbps, which is 40 times that of the USB1.1 interface. USB2.0 requires motherboard support and can be backward compatible. The same brand USB2.0 mobile hard disk box is 30 to 50 yuan more expensive than the USB1.1, but because of the huge difference in speed, USB2.0 has become the mainstream of the market.
Before the USB2.0 standard came out, the USB1.1 standard was very slow, with the fastest read and write speed of 1.5MB/s; The IEEE 1394(Firewire interface) read and write speed can be close to about 50MB/s, so for a long time, Firewire is synonymous with high-speed transmission.
However, after the USB2.0 standard came out, the maximum reading and writing speed is close to 60MB/s, so that the Firewire interface is left behind in a flash, and almost all computers have USB connection ports, only a few computers have Firewire ports, so the purchase of mobile hard disk can be completely without considering the use of Firewire interface models. There are new mobile hard drives are beginning to support the USB3.0 standard, USB3.0 while maintaining the compatibility with USB 2.0, the transmission speed is greatly improved: the maximum transmission bandwidth is up to 5.0Gbps, that is, 640MB/s. However, if you are using an Apple computer, Firewire can come in handy at this time, and it is more appropriate to choose a mobile hard disk with a Firewire interface. In general, the Firewire interface is a dispensable thing

quakeproof

In terms of shock resistance, the spindle of the 2.5-inch notebook hard disk adopts FBD (FluidDynamicBearing) liquid bearing motor. The oil film replaces the ball, effectively avoiding the high temperature and noise caused by the friction of the ball. At the same time, the oil film can absorb the sudden vibration very well. On the other hand, laptop hard drives generally use the "zero contact" head start-stop technology. In the non-working state, the magnetic head is in the docking area and does not contact the platter. When working, the magnetic head flying height is low, the advanced silicon disk surface is smooth, and the scratch probability caused by accidental vibration of the magnetic head is greatly reduced. These technologies reduce the probability of damage to the mobile hard disk during movement. As a result, many original well-known brand hard drives have passed hundreds of drop tests at different angles in professional laboratories

Development trend

With the rapid application of the Internet, the popularity of all kinds of digital consumer electronic products and the continuous development of the concept of mobile in various fields from business office to personal entertainment and leisure, the demand for personal data storage, especially the demand for mobile storage, is growing faster and faster. Over the past few years, in the mobile storage market, mobile hard disk with its relative to optical media storage (such as CDRWDVDRW, etc.) higher access speed, simpler access process and relative to flash storage (that is, U disk) larger capacity, lower price and other advantages, more and more by ordinary consumers and commercial users, the market space is also growing.
However, in the rapid development of technology, more diversified products, and increasingly fierce competition in the market environment, the trend and development of the market has shown some trends that can be grasped.
Minimize volume, maximize capacity
"Minimize volume, maximize capacity" can be said to imply the development trend of the entire mobile storage device: easy to carry, large space. IBM released its first 1-inch hard drive in 1999 with a capacity of 340MB, increased the capacity to 1GB in 2000, and by 2009, the production 1-inch hard drive could provide more than 4GB of storage space on a disk the size of a five-cent yuan coin. Enough to make a home in a variety of small and dainty consumer electronics. At the same time, as of 2009, the maximum capacity of the 2.5-inch notebook hard drive, which has basically become the standard configuration of mobile hard drives, has reached 80GB, almost equal to the capacity of mainstream desktop hard drives. Although the 1.8-inch hard disk entered the mobile storage market late, it perfectly reconciled the contradiction between volume and capacity. The capacity of a 1.8-inch hard disk is about 50-75% of that of a 2.5-inch hard disk, but it is thinner, smaller, and lighter than a 2.5-inch hard disk. From the perspective of the world's newest and smallest mobile hard disk, 1.8 inches, the structure design is exquisite and compact, and the volume of the entire product is condensed to 68mm×91mm×15mm under the optimal operation, which is equivalent to 1/2 of the traditional 2.5-inch mobile hard disk. It is the smallest mobile hard disk on the global market. As smaller portable devices that require tens of gigabytes of internal storage come to market, we will see more and more adoption of 1.8-inch portable hard drives.

Speed up - the speed at which data is accessed

The access speed of mobile storage devices is still greatly improved. First of all, the interface standard of mobile hard disk has been upgraded from USB1.1 to USB2.0, which is an important milestone in the development of mobile hard disk. The traditional USB specification is specifically designed for low-speed device communication, which determines that its data transmission rate can only reach 12Mbps, but due to the wide application of large files such as video and audio, database and game software, the access speed of mobile storage products has been challenged. USB2.0 interface, the data transmission rate can reach 480Mbps, greatly improving the data transmission speed. As of 2009, more and more mobile storage products on the market began to support USB2.0 interface, Siba company's Pepsi mobile hard disk series products, USB2.0 interface is also standard configuration, so that the series of products not only has the advantages of small volume and large capacity mentioned in the above trend, And in terms of data transmission speed, it also occupies a leading position in the entire mobile storage market.
However, as the industry is widely concerned: Has the USB2.0 interface standard reached the limit of mobile storage in terms of transmission speed? Is it possible that there will be faster interface standards in the future?

Practical - integrating multiple technologies

In 2009, domestic mobile storage manufacturers began to promote multimedia mobile hard drives. Gradually integrate the functions suitable for mass consumers, such as the multimedia mobile hard disk that can play high-definition movies, the high-definition player that can download movies directly with the Internet cable, and the multimedia mobile hard disk player that can also read news, check the weather, and stock online, combining data storage with audio and video entertainment.
The wireless hard disk housing is provided with a USB chip, the housing is also provided with a Bluetooth module and an infrared transmission module respectively connected with the USB chip, and the upper part of the housing is provided with a Bluetooth and infrared switch knob. The U disk can transmit data with computers and other devices through infrared transmission or Bluetooth transmission, eliminating the process of physical plugging, thus greatly extending the service life of the mobile hard disk; At the same time, due to the existence of the Bluetooth module, the mobile hard disk can be used by multiple computers at the same time, which greatly improves its utilization efficiency.

Secure storage

There is no doubt that users are the most concerned about the data security of mobile storage products. Data confidentiality, stability, etc., as a product's sale points (selling points) are direct and indispensable. This development trend is also an important guarantee that mobile hard disks have always occupied a place in the mobile storage product market. Although compared with flash memory, mobile hard disk is temporarily at a disadvantage in shockproof, safety and other performance, but mobile hard disk manufacturers for shockproof, anti-fall and other safety technology exploration has never stopped. In the case of Siba Electronics, many of the technologies applied to the Pepsi 1.8-inch portable hard drive give this product a unique advantage in secure storage. Its automatic balancing roller system can protect the hard disk in harsh environments or sudden vibration can still operate normally, to maximize the protection of hard disk and data security. In addition, Patriot's unique seismic mobile hard disk technology is sought after by consumers who are concerned about storage security. After analysis, human accidents such as accidental falls and collisions are important reasons for threatening data security. Three-dimensional dynamic shock absorption technology. This is AIGO own independent intellectual property rights of shock absorption technology. When the mobile hard disk crashes, the impact energy transmitted to the hard disk is reduced, thus protecting the hard disk data. After security testing, Patriot mobile hard disk can guarantee 1.5 meters fall and the data is safe, and bought a security insurance for the data. At the same time, in the market, there are more and more products in the direction of hardware encryption.

Stylish appearance

As with the development of all electronic products, users of mobile hard drives also have fashionable requirements for the appearance of products, especially when it is a durable consumer product that can be carried around and shown to others. In addition to the appearance of the mobile hard disk is getting smaller and smaller in volume, lightweight and cute, its material performance, feel, decoration, color, and product appearance have also become the demanding conditions of consumers. Mini (Mini) represents not simple, but the synchronous improvement of quality, and the beauty of internal and external repair. Wavy full-metal shell design products, such as Siba's Pepsi Ling, in addition to breaking through the limitations of volume, but also in the shape of a better, with a unique personality and quiet style, with a variety of color design, calm and quiet lake blue, cool and cold gray, soft and elegant purple and dazzling silver white, Bring perfect fashion feeling to different users.
The market is increasingly rich in products, at the same time, the trend of demand and consumption will slowly obtain two-way stability. Although the future market competition will be more intense, but the progress of product technology and the stability of market order will make the majority of mobile storage users and competing manufacturers profit at the same time. With the gradual strengthening and emergence of the comprehensive strength of manufacturers such as Silicon Power Electronics, the leadership of the major players will become more prominent, which will ultimately determine the market share of their products. The future of mobile storage will bring users a better experience

Common fault

Mobile hard disk is used more in the office field, the following introduces several common mobile hard disk troubleshooting cases.
A frequent crash occurs when copying data to an external hard drive
This is not the case when an external hard drive performs the same operation in another computer. Because most of the current mobile hard disks are powered by the USB interface on the motherboard, if the USB interface power supply capacity is insufficient, resulting in unstable voltage when data is exchanged through the USB interface, there will be a crash failure. If the mobile hard disk supports an external power supply, it is best to use the external power supply to power it. If the external power supply is not supported, it is best to reduce the amount of data transmitted, that is, a large amount of data is transmitted multiple times. In addition, if the operating system is unstable, it may also cause the mobile hard disk to crash while working. These external devices have really high power requirements. Therefore, the standard power supply of the computer is 300W.
Blue screen often occurs when using an external hard disk
At first, the USB interface was suspected of insufficient power supply, and after replacing the high-power power supply, the fault remained. Later suspecting that the system was unstable, it was found that there was no driver installed for the VIA(VIA) chipset that came with the motherboard, and in the driver, there was a special USB driver. After reinstalling the motherboard driver, the fault is rectified.
Maintenance tips: Although the Windows operating system comes with a lot of hardware drivers, can also be installed normally, but for some parts that are not compatible, it is best to install the original driver.
The system cannot detect the portable hard disk
Fault symptom: The mobile hard disk is connected to the computer, the hard disk makes a sound of "click, click", the indicator on the hard disk keeps blinking, the system can normally detect the USB device, but can not view the icon of the mobile hard disk.
Fault diagnosis: The fault may be caused by the unstable voltage of the USB port. If the system can detect the USB device, it indicates that the system can detect the hard disk. According to the indicator keeps blinking and accompanied by the sound of "click, click", it can be judged that the mobile hard disk is not damaged.
Troubleshooting: Replace the hard disk to another computer, and troubleshoot if it can be used normally.
Unable to copy files to portable hard drive
Symptom: Connect the mobile hard drive you just bought to your computer, sometimes you can copy the file, sometimes you can't copy it. What is the reason for this?
Analysis and treatment: This is also caused by insufficient power supply. Because the USB hard disk also needs to consume a certain amount of power when working, if the power is accessed directly through the USB interface. Power shortages are likely. Almost all mobile hard disks are attached with a separate external power supply or PS/2 adapter, then as long as the external power supply is connected in advance or through the PS/2 adapter connection, the problem can generally be solved.
Not available with USB extension cable
The mobile hard disk can be used directly into the computer, but the USB extension cable connected to the USB flash drive can not be used, what is the reason?
Analysis and processing: From the problem described above, it is mainly caused by the use of USB extension cable. Because the mobile hard disk is the interface of the USB20 standard, this requires that the cable connecting the computer and the mobile hard disk must support the USB2.0 standard. Therefore, the use of the USB1.1 standard connection cable for the USB flash drive will cause the USB20 standard mobile hard drive to not be correctly identified. Simply replace a USB2.0 standard cable to resolve the problem.
The file name in the portable hard drive is garbled
Fault phenomenon: Just buy not long mobile hard disk just started to use is very normal, some time ago copy some files into, after a few days only to find that the file name of the mobile hard disk files have become garbled. Why is that?
Analysis and processing: The case of garbled file names is mostly caused by the incorrect use of mobile hard disks. For example, the mobile hard drive is removed directly without "safely deleting USB devices", or the mobile hard drive is read and written when the USB port power supply is insufficient. In addition, the mobile hard disk track or sector error, may also lead to the mobile hard disk file name garbled, of course, the most likely cause of such problems is the mobile hard disk power supply is insufficient, many mobile hard disk need double USB interface to achieve power supply and data transmission, if the use of such mobile hard disk, it is necessary to pay attention to must connect.
Problems with dual USB ports
For this kind of problem, if the hard disk is not a serious fault such as bad sectors, generally use the disk tool of Windows can be repaired, the method is as follows: Right-click the folder of the mobile hard disk partition with garbled characters, and choose "Properties" command from the pop-up menu. In the Properties dialog box that opens, switch to the Tools TAB and click the Start Check button in the Debug column

Product encryption

Many users often take a notebook to go out to work, or use a U disk or mobile hard disk to carry a variety of data, but in case of accidental loss, it will cause data disclosure. Is there a way to avoid this? The answer is yes, using BitLocker encryption can also be used to encrypt mobile hard drives, USB sticks, and non-system partitions of computers, and only enter the correct password to access the data inside. In this way, whether the U disk is lost or the notebook is moved by the thief, you do not have to worry about the information inside will be leaked.
The steps for encrypting a non-system partition of a hard drive are exactly the same as for encrypting a USB flash drive.
Encryption method
Step 1 Right click on the partition you want to encrypt, select the "Enable BitLocker" option, then select the "Unlock drive with password" check box in the dialog box that pops up, and set the password in the corresponding field. After setting up, click the "Next" button.
Step 2 In order to avoid the embarrassment of the user forgetting the key and losing access to the data, the wizard provides the recovery key. Users can save the recovery key to a file or print it out and put it in a safe place. In this example, save to a file.
Step 3 Click the "Start Encryption" button to start encryption. The encryption process may take several minutes or longer, depending on the size of the drive. Please wait patiently. After the encryption is complete, click Close in the dialog box that is displayed.
After the encryption is complete, to access the encrypted USB flash drive or hard disk partition in the future, you need to enter the correct password to unlock the drive

The computer hard disk is a very important storage device in the computer, which is responsible for storing information such as the operating system, applications, files and data. Over time, the appearance and basic composition of computer hard drives have also evolved and improved. This article will from the appearance, basic composition, working principle, classification, maintenance and maintenance of many aspects, the characteristics and functions of computer hard disk in detail.

I. Introduction

A computer hard disk is a mechanical storage device used to store data and programs in a computer. With the continuous development of technology, the capacity and speed of computer hard drives are also increasing. At present, there are mainly two types of mechanical hard disk and solid state hard disk on the market, in which the mechanical hard disk uses a rotating disk and read and write magnetic head for data storage, while the solid state hard disk uses flash memory particles and controllers for data storage.

Second, the appearance of the computer hard disk

Computer hard drives are usually rectangular and about the size of the palm of your hand. The main interface types are SATA, SAS, USB, etc., of which SATA interface is the most widely used interface type at present. In addition, the external structure of the computer hard disk also includes the power interface, data interface, fixing screws and other parts.

Three, the basic composition of computer hard disk

1. Hard disk disk

Hard disk platters are the core components of a computer's hard disk and are used to store data. Platters are usually made of aluminum alloy and coated with a magnetic material. The disk rotates at a high speed, and the read and write head flies on the surface of the disk, and the data is read and written by changing the magnetic state of the surface of the disk.

2. Read and write heads

A read/write head is a part of a computer's hard disk used to read and write data. The magnetic head is usually made of ferrite material and has extremely high sensitivity and precision. The magnetic head realizes the reading and writing of the magnetic state on the disk through the principle of electromagnetic induction. When working, the magnetic head needs to be suspended at a certain distance from the surface of the disk to ensure the normal read and write operation.

3. Motor and controller

Computer hard drives also contain components such as motors and controllers. The motor is used to drive the rotation of the platter, usually a brushless DC motor. The controller is responsible for controlling the movement of the read and write magnetic head and data transmission and other operations, which are usually implemented by special chips. In addition, the controller also has error detection and repair functions to ensure data integrity and reliability.

Four, the working principle of computer hard disk

1. Read and write principles of computer hard disk

The read and write operation of the computer hard disk is realized by flying the read and write head on the surface of the disk. When the data needs to be read, the read and write head will find the corresponding data area on the surface of the disc, and then convert the magnetic state of the surface of the disc into an electrical signal through the principle of electromagnetic induction, and then transmit to the computer after amplification and processing. When data needs to be written, the read and write magnetic head will find the corresponding data area on the disk surface, and then achieve the data writing by changing the magnetic state of the disk surface.

2. Workflow of computer hard disk

The work flow of computer hard disk mainly includes the following steps: First, the computer issues read and write instructions to the controller; Then, the controller controls the motor to drive the disk rotation, and moves the read and write head to the corresponding data area; Next, the read and write head reads and writes data; Finally, the data after reading and writing is transmitted to the computer through the controller. In the whole process, the controller plays a core role, which not only controls the precise movement of the read and write head, but also handles tasks such as data transmission and error detection.

Five, the classification of computer hard disk

1. The difference between mechanical hard disk and solid state hard disk

Mechanical hard drives and solid state drives are the two main types of computer hard drives on the market today. Mechanical hard drives use rotating platters and read/write heads for data storage, while solid state drives use flash memory grains and controllers for data storage. Compared to mechanical hard drives, solid state drives have higher speed and stability, but they are also more expensive. In addition, the capacity of SSDS is usually smaller than that of mechanical hard drives.

2. Computer hard drives of different sizes and capacities

Computer hard drives come in a variety of sizes and capacities. Specifications mainly include interface type, disk number, cache size and other parameters; The capacity mainly includes different specifications such as TB level and GB level. Different specifications and capacities of computer hard disks are suitable for different application scenarios and requirements. For example, high-capacity mechanical hard drives are suitable for storing large amounts of data and files, while high-speed solid-state drives are suitable for programs and application scenarios that need to get up and running quickly.

3. Common computer hard disk models and sizes

(1) 2.5-inch hard disk: 2.5-inch hard disk is the standard size of notebook hard disk, small size, easy to carry. Its capacity is usually between 160GB and 2TB, and the speed is generally 5400rpm or 7200rpm. In addition, 2.5-inch hard drives are available in thinner models, such as 7mm and 9.5mm thicknesses, for different types of laptops.
(2) 3.5-inch hard disk: 3.5-inch hard disk is the standard size of desktop hard disk, the volume is larger, the capacity is usually between 500GB and 20TB. Its speed is generally 7200rpm or 5900rpm, and there are higher speed models up to 10,000 RPM or 15,000 RPM. The 3.5-inch hard disks also have different types of interfaces, such as SATA and SAS, which are suitable for different application scenarios and requirements.
(3) The M.2 hard disk refers to the solid-state hard disk with the M.2 interface, which has a smaller appearance size, faster read and write speed, and the price is similar to the SATA interface solid state disk. In addition to being a system disk, the M.2 hard drive can also be used as a mobile solid state drive. Some M.2 SSDS on the market using large brands of original particles have stable and reliable performance, such as the Inderm P3 series, with sequential write and sequential read speeds of up to 3000MB/s and 3500MB/s, respectively, basically reaching the upper limit of PCIe 3.0. There are three types of M.2 hard drives: SATA, AHCI, and NVMe, of which NVMe drives are the fastest.

The computer hard disk is the main storage device of the computer. Hard Disk (Hong Kong and Taiwan called hard disk, English name: Hard Disk Drive, short for HDD full name Winchester hard disk) consists of one or more aluminum or glass disks. The discs are covered with a ferromagnetic material.
The vast majority of hard drives are fixed drives, permanently sealed and secured in the hard drive. Early hard disk storage media were replaceable, but today's typical hard disk is a fixed storage medium, sealed inside the hard disk (except for a filter hole to balance air pressure). With the development, removable hard disk also appeared, and more and more popular, more and more types. Most of the hard disks installed on microcomputers are called "winchester hard disks", or simply "warm disks", because they use Winchester technology.

An HDD is a mechanical storage device consisting of a disk, a magnetic head, and a motor. It has the characteristics of large storage capacity, low price and high durability, and is suitable for personal computers, servers, multimedia storage and data backup scenarios. Compared with SSDS, HDDS have the advantage of being cheap and widely applicable, but they are slower to read and write and less earthquake-resistant.
HDD is called hard disk drive, the internal disk, magnetic head, motor and other components, by rotating the disk and moving the magnetic head to read and write data. This article describes the working principle, features, and application scenarios of HDD.
First, the working principle of HDD

An HDD is a mechanical storage device that consists of a disk, a magnetic head, a motor, and other components. The disk, the most critical component of an HDD, is a metal disk coated with a layer of magnetic material.

The magnetic head is a device used to read and write data, which is located on the surface of the disk and can be moved to different tracks to read and write data. A motor is a device used to drive disk rotation, which can make the disk spin at high speed. HDDS work by spinning disks and moving magnetic heads to read and write data.

A primary computer storage medium consisting of one or more aluminum or glass discs. The discs are covered with a ferromagnetic material. The vast majority of hard drives are fixed drives, permanently sealed and secured in the hard drive. Removable hard drives are becoming more and more popular, and there are more and more types.

A hard disk drive (HDD) is a device in a personal computer that controls the hard disk's addressing and access to data. Through the hard drive, the computer can store data. Although hard drive and hard disk are two concepts, because the two are usually packaged together, either hard disk or hard drive usually refers to the device formed by combining the two.

A mechanical hard disk mainly consists of a magnetic head and a disk. The magnetic head is a key part of the mechanical hard disk to read and write data. When a mechanical hard disk is working, the head writes track data or reads existing data while the disk is spinning.

Early desktop computer hard disk use IDE interface, IDE interface hard disk is cheap, but the cost performance is low; Most personal computers use SATA interfaces or SCSI interfaces. The advantage of a SCSI interface hard disk is that up to seven different devices can be attached to the same controller panel. Since the hard drive spins at a constant high speed of 3000-15,000 revolutions per minute, it takes only a short time to read data from the hard drive.

If the SSD is powered off, the current may disturb the main control, which causes the main control to break down. Therefore, users who use solid state drives, please do not arbitrarily power off. Although SSDS are in principle several orders of magnitude less likely to break than mechanical hard drives, they still cannot withstand human failure.

Second, the characteristics of HDD

1, large storage capacity: storage capacity can reach several TB or even tens of TB, to meet the needs of large-capacity data storage.

2, read and write speed is slow: because HDD is a mechanical storage device, read and write speed is slow, such as reading data, need to wait for the head to move to the correct track.

3, the price is cheap: compared with SSD and other solid state drives, the price of HDD is cheaper.

4, high durability: HDD is a mechanical storage device, relatively durable.

5, wide range of application: HDD is suitable for a variety of computers and servers, can meet the needs of different application scenarios.
3. Application scenarios of HDD

HDD is applicable to a variety of computers and servers and can meet the requirements of different application scenarios, including the following:

1, personal computers: HDD is suitable for personal computers, can be used to store operating systems, applications, documents and other data.

2, server: HDD is suitable for servers, used to store a large amount of data, such as website data, database data, etc.

3, multimedia storage: HDD is suitable for multimedia storage, can store music, video, photos and other multimedia data.

4, data backup: HDD is suitable for data backup, can be used to back up important data, protect data security.
Fourth, HDD and SSD comparison

Solid State Drive (SSD) is a type of solid state drive (SSD), which has higher read/write speed and stronger shock resistance than HDD. Power consumption is low, but SSDS are relatively expensive.
V. Summary

The features of HDD include large storage capacity, slow read and write speed, low price, high durability, and wide application range. HDD is applicable to a variety of computers and servers and can meet the requirements of different application scenarios.

Compared with SSDS, the advantages of HDD include cheap price and wide application range, and the disadvantages include slow read and write speed and poor shock resistance.

Introduction to Portable Hard Disk alias name is Portable ssd

Portable hard disk is a kind of portable storage device, which uses the hard disk as the storage medium, so that computers can easily exchange large-capacity data. The device is designed to emphasize portability, making it ideal for situations where you need to carry large amounts of data around with you. There are two main types of mobile hard drives: mobile solid state drives (SSDS) and mobile mechanical hard drives (HDDS). Mechanical hard drives are generally more cost-effective and relatively inexpensive, while solid state drives offer faster transfer speeds and are suitable for users who need to transfer data quickly, especially when working away from home.

The components of a mobile solid-state drive usually include a main controller, a memory unit, and a bridge chip. The housing is generally made of metal, which not only helps to dissipate heat, but also provides protection against pressure and shock. When the hard drive is connected to a computer or phone, an indicator will light up, indicating that the hard drive is working. In terms of interface, the common USB 2.0/3.0 type, and more high-end products may be equipped with USB 3.2Gen 2x2 interface, which means that the portable hard disk transmission speed of this interface can reach 2000MB/s, which means that several GB of video files can be transferred in a few seconds.

Product characteristics

Large capacity

Portable Hard Disk can provide a considerable storage capacity, is a more cost-effective mobile storage products. Portable hard disk can provide users with large storage capacity and good portability at an acceptable price range. At present, the mobile hard drives on the market can provide 320GB, 500GB, 600G, 640GB, 900GB, 1000GB(1TB), 1.5TB, 2TB, 2.5TB, 3TB, 3.5TB, 4TB and other capacities, up to 12TB capacity, to a certain extent to meet the needs of users. With the development of technology, the capacity of Portable Hard Disk will be larger and larger, and the volume will be smaller and smaller.

Small size

Most of the Portable Hard Disks use USB and IEEE1394 interfaces, which can provide higher data transmission speed. However, the data transmission speed of the Portable Hard Disk is limited to a certain extent by the interface speed, especially in the USB1.1 interface specification products, when transferring a large amount of data, it will test the patience of the user. USB2.0 and IEEE1394 interfaces are much better.

High speed

Most of the Portable Hard Disks use USB, IEEE1394, eSATA interfaces, which can provide a high data transmission rate. However, the data transmission rate of the Portable Hard Disk is limited by the interface speed to a certain extent, especially on the products of the USBl.1 interface specification, which will test the patience of the user when transferring large data. The USB2.0, IEEE1394, eSATA interfaces are much better. USB2.0 interface transmission rate is 60MB/s, IEEE 1394 interface transmission rate is 50 ~ 100MB/s, and eSATA, when exchanging data with the host, read a gigabyte order of large files in a few minutes, especially suitable for video and audio data storage and exchange.

Easy to use

Now the PC is basically equipped with USB function, the motherboard can usually provide 2~8 USB ports, some displays will also provide USB adapters, USB interface has become a necessary interface in personal computers. USB devices can be used in most versions of WINDOWS operating systems without the need to install drivers, with a true "plug and play" feature, flexible and easy to use.

Safe and reliable

Data security has always been the most concerned issue of mobile storage users, and it is also an important standard for people to measure the performance of such products. Portable Hard Disk has won the favor of many users with the advantages of high speed, large capacity, lightweight and convenient, and the greater advantage is the security and reliability of its stored data. This kind of hard disk is similar to the structure of the laptop hard disk and uses silicon disk. This is a more durable platter material than aluminum and magnetic, and has greater storage capacity and better reliability, improving data integrity. The use of silicon as a material disk drive, featuring a smoother disk surface, effectively reduces the number of irregular disks that may affect the reliability and integrity of the data, and the higher disk hardness makes the USB hard disk have high reliability.

Matters needing attention

The use of Portable Hard Disk should pay attention to the following problems:
1, do not use for a long time. Use a Portable Hard Disk with general materials, it is best not to plug in the computer for long-term work, Portable Hard Disk is used for temporary exchange or storage of data, not a local hard disk. Compared with the internal hard disk will work in a harsh environment at all times, the working time should be shortened as much as possible.
2. Do not defragment the disk. Do not defragment the removable hard disk, otherwise it will easily damage the hard disk. If you really need to organize, the method can be used to copy the data in the entire partition, and then copy back.
3, do not mix the power supply line. Do not mix the power cables. Because the power cables of the Portable Hard Disk box are dedicated, the voltage of the power cable interface may be different. If you insert them improperly, the box will be burned, and the hard disk will be burned.
4. Don't beat. Don't beat, take lightly; Pay attention to the temperature, do not overheat; Dry and waterproof, pull back first.
5, do not implement hot swap in the transmission process to prevent electromagnetic, dust, water and other external interference.

dimension

At present, mobile hard drives can be divided into three types by size: 3.5-inch desktop hard drives; 2.5-inch laptop hard drive; 1.8-inch micro hard disk. Among them, the 3.5-inch desktop hard disk has the advantages of fast speed and large capacity, but it is large, heavy and inconvenient to carry, and because the hard disk is designed for the desktop, the shockproof performance is poor, but there are still certain advantages in terms of price and capacity. 2.5-inch notebook hard disk is specially designed for the notebook, the size and weight are smaller. There is also a special design in shock resistance, good shock resistance, the most used in the current Portable Hard Disk. 1.8 inch micro hard disk, also designed for notebooks, good seismic performance, and size, weight is also the smallest of the three, but its price is higher, the capacity is smaller, more difficult to popularize, more suitable for special needs users.

capacity

Capacity is the storage space of the mobile hard drive. In 2006, the mainstream hard drive capacity was increased from 160GB to larger capacity. At present, the 250G and 320G products are quite cost-effective. The world's largest single disk capacity reached 750G, 320G product market has been quite mature, the price is also very reasonable. And 400G or above products are still a high-priced series, ordinary users rarely consider. Although 160G and 250G are the mainstream capacity, but limited to cost and actual use needs, for general office and home applications, the choice of 80G or even lower 40G has been fully able to meet the needs.

port

The interface type refers to the type of interface used by the Portable Hard Disk to connect to the computer system, rather than the interface type of its internal hard disk. Because the Portable Hard Disk can be connected to the system through the interface, the interface determines the performance and data transmission speed of the connection with the system. At present, the common data interfaces of mobile hard drives are USB and IEEE1394. USB is the mainstream interface of Portable Hard Disk at present, and it is also the interface of almost all computers, with the advantages of hot swappable, unified standards, and multiple external devices. There are two USB standards: USB1.1 and USB2.0. The USB2.0 transfer speed is up to 480Mbps, which is 40 times that of the USB1.1 interface. USB2.0 requires motherboard support and can be backward compatible. The same brand USB2.0 Portable Hard Disk box is 30 to 50 yuan more expensive than the USB1.1, but because of the huge difference in speed, USB2.0 has become the mainstream of the market.

SanDisk is the world's largest supplier of flash data memory cards. Born in Palo Alto, California in 1988, the company was founded in 1988 by Dr. Harari Eli, an international authority in the field of non-volatile storage technology. In November 1995, Sandisk became a publicly traded company with the Nasdaq ticker SNDK. In 2004, Sandisk had revenues of $1.8 billion. The company employs more than 5,000 people worldwide. The company is headquartered in Milpitas, California, USA. Sandisk's products are sold through more than 260,000 retail stores worldwide.

Sandisk's Asia Pacific headquarters is located in Hong Kong. Sandisk also has sales offices in Shanghai, Taipei and Seoul, and sells its products through the Original Equipment Manufacturer (OEM) channel and a network of distributors and retailers in numerous Asian countries and regions, including China, Taiwan, South Korea, Singapore, Thailand and the Philippines.

At the end of 2006, Sandisk opened its first manufacturing facility in Shanghai, China, using the most advanced manufacturing technology to produce industry-leading products. Sandisk designs, develops, manufactures and markets flash memory card products for use in a variety of electronic systems. Flash cards allow data to be stored in a compact, removable format. SanDisk's flash memory card products help drive mass market sales of digital cameras, multimedia mobile phones, USB flash drives, and other digital consumer devices. Sandisk holds more than 4,900 patents in the United States and other countries and licenses its technology to a number of companies.
In October 2015, Sandisk was acquired by Western Digital for $19 billion.

Market share

Sandisk focuses on three digital consumer markets: digital cameras and other consumer electronics, full-featured mobile phones, and USB flash drives. SanDisk is a leader in the production and sales of flash memory cards, with approximately one-third of the global market share. According to Semico Research, the worldwide flash memory card market reached $3.3 billion in revenue in 2003 and is expected to grow to $12 billion by 2006. SanDisk's strategy is to identify mass consumer markets for flash memory products and manufacture a large number of flash cards in all major formats for the target market, thus enabling SanDisk to provide one-stop sourcing for its retail and OEM users. SanDisk's fiscal 2004 revenue was $1.8 billion, up from $1.1 billion in 2003. Net profit in 2004 was $267 million.

Main product

Sandisk is the only company with the right to manufacture and sell all major flash memory card formats, Including CompactFlash® (CF), SD, microSD, SmartMedia, MultiMediaCard (MMC), Memory Stick PRO and other Memory Stick products, As well as an xD-Picture Card and USB flash drive. The majority of the company's flash card revenue comes from sales to retailers, with the remainder coming from sales to Oems.
SanDisk's products also include USB flash drives (Cruzer® line), SanDisk Ultra® II and SanDisk Extreme? For advanced and professional photographers. Series card products, PC cards and card readers. SanDisk cards have storage capacities ranging from 32MB to 32GB.
Sandisk also makes the second most popular mp3 player in the U.S. Sansa is its brand of MP3 music and video player. Sansa MP3 features an expandable slot for flash memory cards, heralding the evolution of records from vinyl, tape, CD, and flash memory cards, becoming smaller and more user-friendly.

Innovation process

February 21, 2012Sandisk announces new ExtremeSOLID STATE DRIVE
February 14, 2012
Sandisk announces the launch of the high-performance X100 solid-state drive
September 15, 2011
A Sandisk Superhighway? SSD (SanDisk UltraSolid State Drive)
October 20, 2011
Sandisk has launched a new line of retail products designed to capture, share and store digital content
August 9th, 2011
Sandisk embedded SSD with new SATA µ SSD?  Standard
July 12, 2011
Toshiba and Sandisk celebrate the launch of Fab 5, a 300mm NAND flash memory plant in Japan
May 31, 2011
The Asus UX series of ultra-thin laptops are powered by SanDisk SSD
May 31, 2011
Sandisk launches Two new solid-State drives (SSDS) for tablets and slim laptops
May 31, 2011
Sandisk's new iNAND? EXTREME dramatically improves tablet multimedia performance and speed
May 3rd, 2011
Happy May Day Sandi accompany you
February 16, 2011
Sandisk is uniquely positioned to help Oems deliver high-performance, reliable and cost-effective smartphones and tablets
February 16, 2011
Sandisk's iNAND embedded flash memory makes it possible to develop powerful, ultra-thin mobile devices
February 16, 2011
Sandisk's modular SSDS are used in Acer's new Iconia Tab Windows 7 productivity tablet
February 2nd, 2011
Sandisk introduces USB flash drive security software and online backup capabilities
February 2nd, 2011
Sandisk announces SDHC card with UHS-I technology - best suited for taking high-resolution photos and full HD video
February 2nd, 2011
Sandisk launches the world's fastest high-capacity CF card
2010.3.23
Sandisk has officially released the world's first 32GB MicroSD Card.
And in the Shanghai factory officially held the "Sandisk 2010" press conference
2010
Sandisk has developed a 32nm process and will introduce 23nm by the end of 2010, greatly reducing costs
2009
Sandisk Chinese name changed from "Sandisk" to "Sandisk"
2006
Announced its intention to acquire M-Systems
Announced the opening of a retail branch in India
Joe moved to a new office in Milpitas, California
2005
Launched microSD - the world's smallest memory card
Celebrating the completion of the NAND Flash 300mm chip plant in Yokkaichi Operations (in partnership with Toshiba)
SanDisk Ultra® II SD Plus, a dual-purpose SD memory card with built-in USB connectivity
2004
Launched a new line of portable digital music players
The world's fastest and highest performance flash memory card, the SanDisk Extreme III, is introduced
Opens its first retail center in China
Introduces Cruzer Titanium - the world's most robust USB flash drive
The year 1994
CompactFlash(CF) cards have replaced PCMCIA cards as the industry standard for digital cameras.
The year 1993
Established offices in Germany, China, the Netherlands and Israel

Service market

SanDisk produces transformative storage products in world-class manufacturing facilities that churn out hundreds of millions of flash memory chips each year. We serve three large, high-growth markets where demand for flash memory is increasing in order to provide consumers and businesses with attractive advantages:

Cell phone

Mobility is everywhere, and flash technology is powering this revolution. Without flash storage, there would be no smartphones or tablets. That's why nearly every major handset manufacturer, tablet developer, and chipset vendor in the world is relying on SanDisk's embedded and mobile storage technology to realize the full potential of mobile devices.

compute

Our solid-state drives (SSDS) are helping to change the landscape of computing technology. Whether it's reducing power consumption and footprint in cloud data centers, or expanding laptop storage capacity for hobbyists, flash-based SSDS are increasingly becoming a more attractive alternative to traditional hard disks (HDDS).

Consumer electronics

Whether you're a professional photographer with top-of-the-line memory cards, a consumer with a best-selling MP3 player, or a business person who relies on secure USB drives, our consumer electronics products make for a better digital experience. Our products are known for outstanding quality, performance and reliability and have won many industry innovation awards.

Social responsibility

At SanDisk, we believe that corporate social responsibility (CSR) is an important factor in the overall success of a business. This means adopting ethical and sustainable business practices to guide the way we do business, with a focus on stakeholders and the environment.
It also means supporting worthy institutions and causes that improve people's lives and are committed to the long-term development of communities.
We strive to pursue the following policies:
1, safeguard the human rights of employees, safeguard the dignity of employees, respect employees.
2. Establish procedures and processes designed to (i) comply with applicable laws and regulations and SanDisk's internal guidelines, and (ii) uphold ethical standards.
3. Develop policies and processes designed to reinforce the notion that SanDisk's product and service quality, production consistency, and employee well-being are predicated on a safe and healthy work environment.
4. Develop policies and processes designed to promote environmental responsibility as an integral part of SanDisk's culture and to provide world-class products and services.

After-sale situation

SanDisk Sandisk has its own general agents and distributors all over the world, based on which to establish a strong after-sales service network, including the mainland after-sales service maintenance authorized Beijing Yakun Supply Chain Management Co., LTD.
After-sales service center Chengdu, Chongqing, Kunming, Guiyang, Guangzhou, Shenzhen, Fujian, Nanning, Wuhan, Changsha, Nanchang, Xi 'an, Ningbo, Hefei, Harbin, Dalian, Taiyuan, Beijing, Changchun, Shenyang, Tianjin, Qingdao, Hangzhou, Jinan, Nanjing, Shanghai, Shijiazhuang, Zhengzhou, Suzhou, Hong Kong. Relying on these 30 customer service centers for china, Sandisk mainland sales and consumers to provide excellent after-sales service and technical support.

After-sales service process

When consumers purchase products that require technical support or related after-sales service:
1. Please call the customer service hotline, the staff will help you solve the question, or assist you to handle the after-sales service application.
2. For products within the scope of after-sales service, after consumers provide relevant information, the staff will inform the "after-sales service number", as well as the address and contact information of the latest after-sales service center. Consumers can go to or mail products to the after-sales service center with the "after-sales service number", and the staff will arrange relevant after-sales service matters for you.
3. Through the after-sales service and technical support website, you can also apply for after-sales service.
After-sales service and technical support hotline working hours: 9:00-19:30, Monday to Friday
After-sales service center working hours: 9:30-17:30, Monday to Saturday
Product anti-counterfeiting inquiry
After purchasing SanDisk products, if you need to verify the authenticity, you can log in to the SanDisk anti-counterfeiting query verification Center and enter the correct 18-bit anti-counterfeiting verification code according to the prompts.