Directions (Q91–95): A disk has a sector size of 512 bytes, 2000 tracks per surface, 50 sectors per track, five double-sided platters and an average seek time of 10 ms.
If the disk platters rotate at 5400 rpm (revolutions per minute), then approximately what is the maximum rotational delay?
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Correct answer: A. 0.011 seconds
Explanation
5400 rpm = 90 revolutions per second; one revolution (the maximum rotational delay) takes 1/90 ≈ 0.011 s.
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