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From The Free On-line Dictionary of Computing (05 January 2017) [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.
(2009-11-06)