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About Video - How to Repair Hard Disk
When buying a hard disk drive, UK storage pros will encounter many different product specifications. This article explains the key features of hard disk drives -- latency, typical seek times, rotational latency/rotational speed, data transfer rates, error correction codes and buffer/cache size -- so you can specify the right one for your data centre.Seeks and latencyHow quickly the disk can find and read a sector is determined in part by access time. Reading a particular sector consists of two steps. First, the head must be moved to the correct track. Then, once the head is over that track, you must wait for the sector to spin under the head and read the sector. Seek time is the time required for the head to position itself over a track. The latency period is how long it takes the desired sector to move under the head.For more information on buying disk storage in the UKUK data centres buy disk despite smaller storage budgetMoving the head takes a lot longer than waiting for the sector to come around. So low seek times (the time to move the head) are critical to good disk performance.Access time (time to find a sector) equals seek time (time to move to the sector's cylinder) plus rotational latency period (time to wait for the sector to rotate around and appear under the heads).
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