Click on the calculator icon in the upper left corner.
If a disk drive’s rotational speed is 10000 revolutions per minute, what is its average rotational
latency?

A.
0.003 milliseconds

B.
0.05 milliseconds

C.
3 milliseconds

D.
5 milliseconds

Explanation:
Rotational Latency

Calculation
Rotational Latency= 0.5 / (RPM / 60)
= 0.5 / (10000 / 60)
= 0.5 / 166.666
= 0.003 Seconds
= 3 msec
EMC E10-001 Student Resource Guide. Module 2: Data Center Environment