UGC-NET | UGC-NET CS 2017 Nov – III | Question 53

Consider a disk queue with requests for I/O to blocks on cylinders 98, 183, 37, 122, 14, 124, 65, 67. Suppose SSTF disk scheduling algorithm implemented to meet the requests then the total number of head movements are __________ if the disk head is initially at 53.
(A) 224
(B) 248
(C) 236
(D) 240


Answer: (C)

Explanation: sstf
Now add all seek time:
12+2+30+23+84+24+2+59=236
So, option (C) is correct.

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