Suppose that a disk drive has 5000 cylinders,numbered 0 to 4999.head position is at 143,previous request is 125.the queue in pending request in fifo order is
86,1470,913,1774,948,1509,1022,1750,130.
starting from head position by using
a.fcfs
b.sstf
c.scan
d.look
e.c-scan
f.c-look