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Consider a disk with an average seek time of $4$ ms.

Motor speed 15000RPM

512B sector

500 sector per track

A file occupies all of the sectors on $5$ tracks

Each track reading requires average seek time and average rotational delay

  • What will be transfer time of $1$ track?
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1 rotation time = 4ms

1 track rotation time=4ms

1 sector rotation time=4/500 ms = 8microsec

So, transfer time of sector=1sector rotation time

                                         =8microsecond

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