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Let disk request come to a disk driver for cylinders in the order 10, 22, 20, 2, 40, 6 and 38, at the time when the disk driver is reading from cylinder 20. If the seek time is 6 ms per cylinder, then the total seek time for the disk arm scheduling time algorithm (FCFS - First Come First Serve) is:

Let disk request come to a disk driver for cylinders in the order 10, 22, 20, 2, 40, 6 and 38, at the time when the disk driver is reading from cylinder 20. If the seek time is 6 ms per cylinder, then the total seek time for the disk arm scheduling time algorithm (FCFS - First Come First Serve) is: Correct Answer 876 ms

Data:

Seek time = t = 6 ms per cylinder

Head = 20

Concept:

Since, it is a first-come-first-serve scheduling requests will be served in the given sequence:

10, 22, 20, 2, 40, 6 and 38

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Formula:

Total Seek time = total head movement × t

Calculation:

Total head movement = (20 - 10) + (22 - 10) + (22 - 2) + (40 - 2) + (40 - 6) + (38 - 6) =

= 10 + 12 + 20 + 38 + 34 + 32 = 146

Total Seek time = 146 × 6 = 876 ms.

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