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From The Free On-line Dictionary of Computing (27 SEP 03) : [ foldoc ]
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.
From WordNet (r) 2.0 : [ wn ]
rotational latency
n : (computer science) the time it takes for a specific block of
data on a data track to rotate around to the read/write
head [syn: latency]