Question

what is the average rotational latency of a disk drive that rotates at 7200 rpm?

Answer 1

8.33 ms

Average rotational latency is time for 1/2 revolution.
Example: 7200 RPM.
One rotation = 60s / 7200 = 8.33 ms.
Average rotational latency = 4.16 ms....

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Answer 2

Answer:

The average rotation latency of disk is $\dfrac{1}{240}$.

Explanation:

The average rotational latency for a disk is one-half the amount of time it takes for the disk to make one revolution.

Rpm into rotation/ sec

7200 rpm=120 rotation/sec

120 rotation = 1 sec

$1 rev=\dfrac{1}{120}\ s$

The average rotational latency for disk is one half the amount of time.

The average rotation latency =$\dfrac{1}{2\times120}$

The average rotation latency =$\dfrac{1}{240}$

Hence, The average rotation latency of disk is $\dfrac{1}{240}$.