Hdd Meaning
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.
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