[1] : WordNet (r) 2.0

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
see also:
latency 

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

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.
     
     
see also:
sector disk drive access time 

Rotational >> R Words
Rotational, definition of term: Rotational
rotational_pag1.html

Latency >> L Words
Latency, definition of term: Latency
latency_pag1.html