In a system containing CPU 1 and Disk Drive A,the system is instructed to access Track 1,Track 9,Track 1,and then Track 9 of Drive A.The arm is initially located at Track 1.Drive A requires 35 ms for each move.Without reordering,Drive A requires ____ to complete the access.
A) 30 ms
B) 35 ms
C) 70 ms
D) 105 ms

Question

Quizplus · Accepted Answer

The arm starts at Track 1, moves to Track 9 (1 move), back to Track 1 (1 move), and then to Track 9 again (1 move). That's 3 moves in total, each taking 35 ms, so 3 * 35 ms = 105 ms.

In a System Containing CPU 1 and Disk Drive A,the