rotational latency

Question

If you know the RPM, then how do you calculate the rotational latency?

See this set of 6 closely related questions: superuser.com/questions/119446/sectors-and-clusters superuser.com/questions/119051/transfer-time-for-a-file superuser.com/questions/107723/hard-drive-sectors-vs-tracks superuser.com/questions/119048/number-of-tracks superuser.com/questions/119026/rotational-latency superuser.com/questions/119030/bytes-per-track
And superuser.com/questions/120461/transfer-time-of-a-cylinder

Alexander Burke · Answer 1 · 2010-03-12 07:49:11Z

up vote 4 down vote accepted

(1 / (RPM / 60)) * 0.5 * 1000

Or, in other words:

30000 / RPM

Result in ms.

answered Mar 12 '10 at 7:49

	That would be the average rotational delay. The maximum would be twice that. – Phenom Mar 13 '10 at 5:11
	If this answers your question, please mark it as accepted! :) – Alexander Burke Mar 13 '10 at 6:19

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