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rotational latency

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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
latency
computer science, computing - the branch of engineering science that studies (with the aid of computers) computable processes and structures
access time - (computer science) the interval between the time data is requested by the system and the time the data is provided by the drive; "access time is the sum of seek time and rotational latency and command processing overhead"
interval, time interval - a definite length of time marked off by two instants
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At 7200 RPM, the 7K60 spins 33 percent faster than its 5400 RPM counterpart, resulting in the following improvements: --Faster data transfer rate of 15 percent (rate at which data is read and written) --Lower rotational latency of 20 percent (time it takes disk to get data under the read/write head) The 7K60 also shows a 20-percent improvement in average seek time (time it takes the read/write arm to arrive at the desired data track).
Hitachi mini takes giant leap in notebook hard drives by EDP Weekly's IT Monitor
At 7200 RPM, the 7K60 spins 33 percent faster than its 5400 RPM counterpart, resulting in the following improvements: -- Faster data transfer rate of 15 percent (rate at which data is read and written) -- Lower rotational latency of 20 percent (time it takes disk to get data under the read/write head) The 7K60 also shows a 20-percent improvement in average seek time (time it takes the read/write arm to arrive at the desired data track).
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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