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rotational latency

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.01 sec.
rotational latency [rō′tā·shən·əl ′lāt·ən·sē]
(computer science)
The time required, following an order to read or write information in disk storage, for the location of the information to revolve beneath the appropriate read/write head.
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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Lower rotational latency of 20 percent (time it takes disk to get data under the read/write head)
Hitachi mini takes giant leap in notebook hard drives by EDP Weekly's IT Monitor
Lower rotational latency of 20 percent (time it takes disk to
Hitachi Mini Technology Takes Giant Leap in Notebook Hard Drives by Business Wire
Rotational latency can also be reduced using out-of-order data delivery, a feature that doesn't require the head to access the starting LBA first.
Supercharging SATA drive performance: Native Command Queuing makes ... by Clark, Joni / Computer Technology Review
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