Tuesday, 1 January 2013

Seek time and Latency with respect to disk I/O.

Definition of Seek time and Latency in Hard Disk:

Seek Time - As soon as the read/write command is received by the disk unit,the read/write heads are 1st positioned on to the specified track/cylinder number.The time required to position the read/write head over the desired track is called seek time.

Latency - Once the heads are positioned on the desired track,the head on the specified surface is activated.Since the disk is continuously rotating,the head should wait for the specified sector to come under it.This rotational waiting time required to spin the desired sector under the head is called latency(Rotational Delay Time).

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