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).