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Answer :
Final answer:
The average latency of a disk drive with a spindle speed of 20000 rpm is approximately 0.0015 seconds.
Explanation:
To calculate the average latency of a disk drive, we need to divide the time taken for one complete rotation by 2. In this case, the given information is that the disk spindle speed is 20000 rpm.
First, we need to convert the spindle speed from revolutions per minute (rpm) to revolutions per second (rps). To do this, we divide the spindle speed by 60:
Spindle speed in rps = 20000 rpm / 60 = 333.33 rps (rounded to two decimal places)
Next, we calculate the time taken for one complete rotation by taking the reciprocal of the spindle speed:
Time for one rotation = 1 / 333.33 rps = 0.003 seconds (rounded to three decimal places)
Finally, we divide the time for one rotation by 2 to get the average latency:
Average latency = 0.003 seconds / 2 = 0.0015 seconds (rounded to four decimal places)
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