|Noun||1.||rotational latency - (computer science) the time it takes for a specific block of data on a data track to rotate around to the read/write head|
|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.