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System Software and Operating System - File and Input/Output System

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66. Disk requests come to a disk driver for cylinders 10, 22, 20, 2, 40, 6 and 38, in that order at a time when the disk drive is reading from cylinder 20. The seek time is 6 ms per cylinder.
If the scheduling algorithm is the closest cylinder next, then the total seek time will be

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67. Disk scheduling involves deciding

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68. Poor response time are caused by

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69. 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

  • 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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70. 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 transfer rate will be

  • Option : A
  • Explanation : In 25 ms, one rotation is completed and all the 62500 bits are transferred. So in 1ms, 2500 bits are transferred. Accordingly, in 1s, 2.5Mb are transferred. Thats why the speed is 2.5Mb/s
    MB - Mega Bytes,
    Mb-Mega bits
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File and Input/Output System