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The disk head is at cylinder 40 and the request queue is 12, 95, 60, 25, 150, 70. What is the total head movement under SSTF scheduling?

1306Medium DSSSB TGT Computer Science 0 replies 1 views
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The disk head is at cylinder 40 and the request queue is 12, 95, 60, 25, 150, 70. What is the total head movement under SSTF scheduling?

  • A196
  • B186
  • C166
  • D386
Correct answer: C

Explanation

SSTF serves 25 (15), 12 (13), 60 (48), 70 (10), 95 (25) and 150 (55), totalling 15 + 13 + 48 + 10 + 25 + 55 = 166 cylinders.
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