12.8 Suppose that a disk drive has 5,000 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:
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
d. LOOK
e. C-SCAN
f. C-LOOK
