Question

In the ______ algorithm, the disk arm goes as far as the final request in each direction, then reverses direction immediately without going to the end of the disk.

a) LOOK
b) SCAN
c) C-SCAN
d) C-LOOK

Answer 1

The LOOK algorithm is where the disk arm reverses direction immediately after servicing the final request in each direction, without reaching the end of the disk.

Step-by-step explanation:

In the LOOK algorithm, the disk arm goes as far as the final request in each direction, then reverses direction immediately without going to the end of the disk. The LOOK scheduling algorithm is designed to optimize the movement of the disk arm, so it only travels as far as the last request in any direction before reversing. This is in contrast to the SCAN algorithm, where the disk arm goes all the way to the end of the disk before reversing, and the C-SCAN (Circular SCAN) and C-LOOK algorithms, where the arm only goes in one direction and after reaching the end or the last request, it jumps back to the beginning or the first request respectively without servicing any other requests on the way back.