Consider a disk queue with requests for I/O to blocks on cylinders 95, 180, 34, 119, 11, 123, 62, 64. The following scheduling algorithms are used. The head is initially at cylinder number 50, moving towards larger cylinder numbers on its servicing pass. The cylinders are numbered from 0 to 199. Which of the following option is true regarding total head movement (in number of cylinders) incurred while servicing these requests?
(A) SSTF < C-SCAN < SCAN
(B) SSTF < SCAN < C-SCAN
(C) SSTF > C-SCAN > SCAN
(D) None of the above.


Answer: (B)

Explanation:

So, option (B) is correct.

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