Question: Suppose that a disk drive has 5,000 cylinders numbered 0-4,999. The drive is currently serving a request at sylinder 143, and the previous request was

Suppose that a disk drive has 5,000 cylinders numbered 0-4,999. The drive is currently serving a request at sylinder 143, and the previous request was at cylinder 125. The queue of pending requests in FIFO order is

86, 1470, 913, 1774, 948, 1509, 1022, 1750, 130

Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following disk-scheduling algorithms?

a. FCFS

b. SSTF

c. SCAN

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