meaning of rotational latency
1. rotational latency The time for the start of the required sector on a disk to appear underneath the read/write head. The worst case is where it has just passed the head when the request is received. For a disk drive with N heads per surface, rotating at R revolutions per minute, the average rotational latency will be L = 30/NR seconds. Rotational latency is one component of access time. rotations per minute revolutions per minute ROTFL
2. computer science the time it takes for a specific block of data on a data track to rotate around to the read/write head
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