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GATE 2020 : Operating System Quiz 10

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Question 1

Using a larger block size in a fixed block size file system leads to

Question 2

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 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

A unix-style I-node has 10 direct pointers and one single, one double and one triple indirect pointers. Disk block size is 1 Kbyte, disk block address is 32 bits, and 48-bit integers are used. What is the maximum possible file size?

Question 5

SCAN algorithm is applied to following request queue 98,183, 37,122, 14, 124, 65, and 67 with head at 53. Now if 10 is inserted in the queue before it started moving towards Zero or Left. Then at which position it will be serviced.

Question 6

Consider a hard disk with 16 recording surfaces (0-15) having 16384 cylinders (0-16383) and each cylinder contains 64 sectors (0-63). Data storage capacity in each sector is 512 bytes. Data are organized cylinder-wise and the addressing format is <cylinder no., surface no., sector no.>. A file of size 42797 KB is stored in the disk and the starting disk location of the file is <1200, 9, 40>. What is the cylinder number of the last sector of the file, if it is stored in a contiguous manner?

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GATE & PSU CS Operating System

Mar 25GATE & PSU CS