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
| A. | 360 ms |
| B. | 876 ms |
| C. | 850 ms |
| D. | 900 ms |
Answer : 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. Kishore R said: (6:17pm on Friday 9th October 2015)
disk drive is reading from cylinder 20,fcfs ,20 2 40 6 38 10 22=138seek time=138x6=824 I had some confusion
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Option: A Explanation : Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. |
