What performance indicators does it have for hard drives?
First, capacity is the data storage of a computer system, and capacity is the most important parameter in a hard disk. The hard disk capacity is megabytes (MB) or gigabytes (GB), and 1GB = 1024 MB. The hard disk capacity index also includes the single disk capacity of the hard disk.
The so-called single disk capacity refers to the single disk capacity of a hard disk. The larger the single disk capacity, the lower the unit cost and the shorter the average access time. Second, the speed (speed or spindle speed) refers to the speed of the motor spindle in the hard disk, that is, the maximum speed that the hard disk can complete in one minute. Speed is one of the important parameters to mark the level of the hard disk. The faster the hard disk is, the faster the hard disk can find files, and the transmission speed of the hard disk is also improved. The speed of a hard disk is expressed in revolutions per minute, and the unit is expressed in RPM. RPM is an abbreviation of revolution per minute. The higher the RPM value, the faster the internal transfer rate and the shorter the access time, the better the overall performance of the hard disk. 3. Average access time Average Access Time (Average Access Time) refers to the time required for the header to reach the target track position from the start position and find the data sector to be read and written from the target track.
The average access time reflects the read and write speed of the hard disk, including the search time and wait time of the hard disk, that is, the average access time = average search time and average wait time. The average seek time of a hard disk (Average Seek TIme) refers to the time required for a hard disk head to move to the surface of a disk to specify a track. Of course, the shorter the time, the better. The average search time of the current hard disk is usually between 8ms and 12ms, while the SCSI hard disk should be less than or equal to 8ms.
The waiting time of a hard disk, also known as a delay (delay), refers to the time when the magnetic head is already on the track to be accessed, and the sectors waiting for access rotate below the magnetic head. The average wait time is half of the time it takes for a disk to spin. Fourth, the hard disk data transfer rate (DataTransferRate) refers to the speed of hard disk read and write data, in megabytes / second. Hard disk data transfer rates include internal data transfer rates and external data transfer rates. The internal transfer rate mainly depends on the speed of the hard disk.
The external transfer rate (External Transfer Rate) is also known as the burst data transfer rate (Burst Data Transfer Rate) or the interface transfer rate, which is called the data transfer rate between the system bus and the hard disk buffer. The external data transfer rate is related to the type of hard disk interface and the size of the hard disk cache. Fifth, the cache (Cachememory) is a storage chip on the hard disk controller, which has a very fast access speed. It is a buffer between the internal storage of the hard disk and the external interface.
Because the internal data transfer speed of the hard disk is different from the external interface, the cache acts as a buffer. The size and speed of the cache is an important factor directly related to the transmission speed of the hard disk, which can greatly improve the overall performance of the hard disk. When the hard disk accesses segmented data, it is necessary to constantly exchange data between the hard disk and memory. If there is a large cache, the segmented data can be temporarily stored in the cache, which reduces the load on the external system and improves the data transmission speed.
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