Consider a disk queue with requests for I/0 to blocks on cylinders 218, 12, 30, 11, 94, 128, 345, 205, 380. The LOOK scheduling algorithm is used. The head is initially at cylinder number 150. The...

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Extracted text: Consider a disk queue with requests for I/0 to blocks on cylinders 218, 12, 30, 11, 94, 128, 345, 205, 380. The LOOK scheduling algorithm is used. The head is initially at cylinder number 150. The cylinders are numbered from 0 to 399. The total head movement (number of cylinders) incurred while servicing these requests is (assume that LOOK algorithm moves towards 399 when it start its execution)