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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ROSE
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Roskind grammars
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rotary debugger
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magnetic disk
rotational latency
scan
rotations per minute
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