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

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

67 Disk scheduling involves deciding

68 Poor response time are caused by

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

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

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

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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Practice Spotlight

Direct Access

Direct access allows a process to read or write a particular file block without processing all preceding blocks. It is especially useful for disk-based databases and other random-access applications.

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Question:

Number of minimal set of required file operations are

A. two
B. four
C. five
D. six

Correct answer: D

Explanation:

Six basic file operations. Creating a file. Writing a file. Reading a file. Repositioning within a file. Deleting a file. Truncating a file.

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