a disk drive has 2,000 cylinders, numbered 0 to 1999. 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
