A disk head is at cylinder 50 and the pending requests are 82, 170, 43, 140, 24 and 16. Using SSTF, which request will be serviced first?
Options
- A. 82
- B. 43
- C. 24
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
B. 43
Detailed Explanation
Explanation: SSTF selects the request closest to the current head position. From cylinder 50, the distances are 32 to 82, 7 to 43, 26 to 24, 90 to 140, 120 to 170 and 34 to 16. Therefore, cylinder 43 is serviced first.