Question

Once the head has reached the desired track, the time spent waiting for the sector to be accessed to appear under the head is called the _______________

(a) Access time

(b) Average seek time

(c) Seek time

(d) Rotational latency time

I have been asked this question in class test.

My question is taken from Magnetic Disk and Flash Storage topic in section Storage and File Structures of Database Management

Answer 1

Correct option is (d) Rotational latency time

To explain: Rotational speeds of disks today range from 5400 rotations per minute (90 rotations per second) up to 15,000 rotations per minute (250 rotations per second), or, equivalently, 4 milliseconds to 11.1 milliseconds per rotation.