A hard disk rotates at 7200 revolutions per minute. Assuming a uniformly distributed rotational position, what is the average rotational latency?
Options
- A. 2.08 ms
- B. 4.17 ms
- C. 8.33 ms
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
B. 4.17 ms
Detailed Explanation
Correct Answer: Approximately 4.17 ms.Explanation: One revolution takes 60 / 7200 seconds = 0.008333 seconds = 8.333 ms. On average, the required sector is half a revolution away.
Average rotational latency: 8.333 / 2 = approximately 4.17 ms.