File and Input/Output System Q.40

0. A certain moving arm disk storage with one head has following specifications : Number of tracks I recording surface 100 Disk rotation speed 2400 rpm Track storage capacity= 62500 bits
The average latency time (assume the head can move from one track to another only by traversing the entire track) is

Answer
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Option : A
Explanation : In 60 seconds, the disk rotates 2400 times. So it takes 25ms to rotate it one time.
There are 200 tracks. On average, 100 tracks need to be traveresed to reach a specific track.
So 25ms*100 tracks= 2.5s time is taken on average to reach a particular track

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