Word:

rotational latency

Noun1.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
Synonyms: latency
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.
access time, computer science, computing, interval, latency, time interval
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-- rotational latency --
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