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# Difference between Seek Time and Rotational Latency in Disk Scheduling

Seek Time:
A disk is divided into many circular tracks. Seek Time is defined as the time required by the read/write head to move from one track to another.

Example,
Consider the following diagram, the read/write head is currently on track 1.

Now, on the next read/write request, we may want to read data from Track 4, in this case, our read/write head will move to track 4. The time it will take to reach track 4 is the seek time.

Rotational Latency:
The disk is divided into many circular tracks, and these tracks are further divided into blocks knows as sectors. The time required by the read/write head to rotate to the requested sector from the current position is called Rotational Latency.

Example,
Consider the following diagram, We have divided each track into 4 sectors.
The systems get a request to read a sector from track 1, thus the read/write head will move to track 1 and this time will be seek time.