In a magnetic disk, average seek time is 8 ms, the track-to-track acceime is 1.5 ms, and the drive rotates at 3600 rpm. What is the average access time?
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In a magnetic disk, average seek time is 8 ms, the track-to-track acceime is 1.5 ms, and the drive rotates at 3600 rpm. What is the average access time?
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The average access time is 17.835 ms.
Explanation:
Rotational latency:-
3600 rotations in 60 seconds.
1 rotation in 60/3600 * 1000
= 16.67ms
Disk access time = seek time + rotational time + transfer time
= 8 + 16.67/2 + 1.5
= 9.5 + 8.335
= 17.835
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