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"Alex Fraser" wrote in message ... "Toshi1873" wrote in message .. . In article , says... Latency [ms] = 30000 / SpindleSpeed [RPM] Where does the 30000 figure come from? If SpindleSpeed is in rpm, we get: Time for one revolution in minutes = 1 / SpindleSpeed There are 60000 ms in a minute, so this is equivalent to: Time for one revolution in ms = 60000 / SpindleSpeed On average, rotational latency is the time for half a revolution, hence: Latency in ms = (1/2) * 60000 / SpindleSpeed = 30000 / SpindleSpeed I wondered where he plucked that figure from, I might have guessed if it was 60000, mind you I did say somewhere in this thread, that on average the data you want to read will be at the other side of the disk, so it is nice to see my 'observation' is part of an industry standard :O) HTH, Alex |
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