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2 definitions found
 for rotational latency
From WordNet (r) 3.0 (2006) :

  rotational latency
      n 1: (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: rotational latency, latency]

From The Free On-line Dictionary of Computing (30 December 2018) :

  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.

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