Consider a disk queue with requests for I/O to blocks on cylinders:

87, 172, 26, 111, 12, 113, 54, 56

in that order. If the disk head is initially at cylinder 53.

1.) Please use First-Come, First-Serviced (FCFS) algorithm to schedule such request queue.

2.)Please use Shortest-Seek-Time-First (SSTF) algorithm to schedule such request queue.

3.)Please use SCAN algorithm to schedule such request queue.

4.) Please use Circular-SCAN (C-SCAN) to schedule such request queue.