Operating Systems · Question 24 · Medium

Operating Systems question 24

A disk has cylinders 0 to 199 and the head is at cylinder 50. The request queue is 82, 170, 43, 140, 24, 16, 190. What is the total head movement (in cylinders) with Shortest Seek Time First (SSTF)?

  1. 208
  2. 642
  3. 332
  4. 314
Answer and explanation

Answer: A. 208

Explanation: SSTF order: 43, 24, 16, 82, 140, 170, 190. Movement = 7 + 19 + 8 + 66 + 58 + 30 + 20 = 208 cylinders.

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