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GATE 2022: Operating System Quiz-10

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Question 1

Match the following groups.
Group-I
A) Access time
B) Seek time
C) Rotational latency
D) Data transfer time
Group-II
1. Desired cylinder
2. Desired sector
3. Actual data
4. Total time start to end

Question 2

Consider the following parameters of a disk system.
• Number of cylinders =

• Number of sector/track=

• Number of surface=

• Number of track per surface=

• Sector capacity=

• Cylinder capacity=

Which of the following is correct to compute the disk capacity of the system?

Question 3

Consider the following characteristics of disk system.
• Seek time is 6 ms per cylinder
• Disk uses shortest seek time first scheduling
• Disk requests for cylinders 8, 24, 20, 5, 41, 8 in that order come into the driver
• Initially disk arm is at cylinder 20 (in ms).
What is the total seek time for the above requests?

Question 4

In a computer system, a disk track can hold 32 sectors each having size of 256 bytes. The rotation rate is 2000rpm.The data rate of disk is______ KB (Approximately).

Question 5

A disk queue having request for Input to blocks on cylinders is 18,69,107,32,Head is initially positioned at cylinder number 51 and moving to upward. Total number of movements require is ____ if C-SCAN disk scheduling algorithm is used and cylinder limit is 199.

Question 6

Consider a disk queue with requests for I/O to blocks on cylinders 98, 183, 41, 122, 14, 124, 65, 67. The C-LOOK scheduling algorithm is used. The head is initially at cylinder number 53 moving towards larger cylinder numbers on its servicing pass. The cylinders are numbered from 0 to 199. The total head movement (in number of cylinders) incurred while servicing these requests is _______.

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GATE & PSU CS Operating System

Jul 22GATE & PSU CS