File and Input/Output System Q.36

0. Disk requests come to a disk driver for cylinders 10, 22, 20, 2, 40, 6 and 38, in that order at a time when the disk drive is reading from cylinder 20. The seek time is 6 ms per cylinder.
The total seek time, if the disk arm scheduling algorithm is first-come-first-served is

Answer
Comment
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Option : B
Explanation : According to FCFS order serverd will be (20),10, 22, 20, 2, 40, 6 and 38
Seek time = 10+12+2+18+38+34+32 = 146
The disk drive has to traverse totally 146 cylinders (verify). So, seek time is 6 x 146 = 876 ms.

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