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Disk writing speed

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Consider a disk holding files with an average file length of 5 KB. Each file is allocated contiguously on adjacent sectors. To better utilize the disk space, it must be periodically compacted, which involves reading each file sequentially and writing it back to a new location. Assuming the standard sector size of 512, an average seek time of 50 ms, 100 sectors per track, and a rotational speed of 5000 rpm, estimate, how long it will take to move 1000 files~?

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The solution provides a detailed and step-by-step explanation for disk writing speed.

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Please see the attached file.

The total time associated with reading/writing a file is the sum of:
Seek time + Rotational delay + Transfer time
Here average seek time is given for 50ms per file
Rotational delay is when: (see attached)

The average rotational delay is half the revolution. In this case ...

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