申論題

1. In a disk scheduling system with 100 tracks indexed from 0 to 99, there are three track access requests: 1, 45, and 15, arriving in this sequence. Suppose that the disk head is currently positioned at track 24 and moving towards track 99, please use the following algorithms to calculate the total distance that the disk arm will move.

(1) SCAN (Elevator) algorithm. (5%)