Assume that a system consisting of CPU 1 and Disk Drive A has to access Track 1, Track 9, Track 1, and then Track 9, and that the arm is already located at Track 1. Without reordering, Drive A requires ____ to complete the access. CPU1 time for 1000 instructions: 30.0 ms
Drive A access speed: 35 ms
A) 30 ms
B) 35 ms
C) 70 ms
D) 105 ms

Question

Quizplus · Accepted Answer

The drive starts at Track 1, moves to Track 9 (35 ms), back to Track 1 (35 ms), and then to Track 9 again (35 ms), totaling 105 ms.

Assume That a System Consisting of CPU 1 and Disk