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Consider a disk queue with requests for I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10. The C-LOOK scheduling algorithm is used. The head is initially at cylinder number 63, moving towards larger cylinder numbers on its servicing pass. The cylinders are numbered from 0 to 199. The total head movement (in number of cylinders) incurred while servicing these requests is _____.

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Correct answer is 346

C-Look disc Scheduling

0 10 11 38 47 63 87 92 121 191 199

∴ Total Head movements = 24 + 5 + 29 + 70 + 181 +1 + 27 + 9 = 346

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