Performance indicators of hard disks
The performance indicators of hard disks include:
Hard disk capacity: This is the most basic element of the hard disk, in megabytes (MB) or gigabytes (GB), indicating the total amount of data that the hard disk can store.
Rotational speed of the hard disk: Refers to the rotation speed of the motor spindle in the hard disk, the unit is rotational speed per minute (rpm), which affects the data transmission rate.
Interface type: Including IDE, SATA, SCSI, etc., affecting the speed and method of data transmission.
Cache size: The cache is a memory chip on the hard disk controller that has extremely fast access speed and acts as a buffer between the internal storage of the hard disk and the external interface.
Internal data transfer rate: Reflects the performance of the hard disk when the buffer is unused, depending on the hard disk's disk speed and disk line density.
External data transfer rate: Also known as burst data transfer rate or interface transfer rate, it is the rate of data transfer between the system bus and the hard disk buffer.
Average seek time: It refers to the time required for the magnetic head to move to the track where the data is located. It is an important indicator to measure the mechanical performance of a hard disk.
Single disk capacity: The amount of information that can be stored on a single platter affects the total capacity and integration of the hard disk.
IOPS: (Input/output operand per second). Indicates the random read/write performance of a hard disk.
Throughput: Unit: MB/s, reflecting the sequential read/write performance of disks.
Response time/delay: The interval between the time a request is made and the time a response is received, in ms or μs.
Continuous time without failure (MTBF): The maximum time from the start of a hard disk to the failure, expressed in hours (h).
Temperature of the hard disk surface: Indicates that the temperature generated by the hard disk increases the temperature of the hard disk enclosure.
These indicators together determine the performance of hard disks. Users should consider the importance of these indicators when selecting hard disks based on their own requirements.
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