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The disk head is at cylinder 50. The request queue is 90, 175, 30, 115, 10, 120, 60, 66. What is the total head movement under SSTF schedul…

The disk head is at cylinder 50. The request queue is 90, 175, 30, 115, 10, 120, 60, 66. What is the total head movement under SSTF scheduling?

Correct answer: A

Explanation

Service order 60, 66, 90, 115, 120, 175, 30, 10 gives 10+6+24+25+5+55+145+20 = 290 cylinders (636 would be FCFS).

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