# GATE Papers >> CSE >> 2016 >> Question No 58

Question No. 58

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 _____________ .

##### Answer : 346.0 : 346.0

Solution of Question No 58 of GATE 2016 CSE Paper

(84 - 63) + (92 - 87) + (121 - 92) + (191 - 121) + (191 - 10) + (11 - 10) + (38 - 11) + (47 - 38)

= 24 + 5 + 29 + 70 + 181 + 1 + 27 + 9 = 346

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