What is the average time to read a 512 byte sector for Seagate ST31000340NS in Figure 6.5? What is the minimum time? Assume that the controller overhead is 0.2 ms, and the disk is idle so that there is no waiting time.

Question

Quizplus · Accepted Answer

The Answer is Average =
Average seek time + Average rotational delay + Transfer time + controller overhead
= 8.5 + 0.5 rotations/7200RPM + 0.5KB/105MBps + 0.2
= 8.5+4.17+0.005+0.2
= 12.875ms
Minimum:
Minimum seek time + Minimum rotational delay + Transfer time + controller overhead
= 0.8 + 0 rotations + 0.5KB/105MBps + 0.2
= 0.8+0+0.005+0.2
= 1.005ms

What Is the Average Time to Read a 512 Byte