Question

A disk drive has 2000 cylinders, numbered 0 to 1999. The drive is currently servicing a request at cylinder 783, with the previous request at cylinder 707. The queue of pending requests, in FIFO order, is 75, 678, 1623, 247, 248, 1529, 182. What distance, in tracks, must the disk read-write arm move in order to service the requests for each of the following disk scheduling algorithms?
a) FCFS
b) SSTF
c) SCAN
d) LOOK
e) C-SCAN
f) C-LOOK

Answer 1

Answer:

Suppose that a disk drive has 5000 cylinders, numbered 0 to 4999. The drive is currently serving a request at cylinder 143, and the previous request was at cylinder 125. The queue of pending requests, in FIFO order, is

Explanation: