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Question 19

Which of the following statements about disk scheduling algorithms is correct ?

  1. AThe disk arm behaves like an elevator in SCAN algorithm
  2. BFCFS provides fastest service to the disk requests
  3. CSSTF algorithm is an optimal algorithm
  4. DSCAN algorithm provides more uniform wait time compared to C - SCAN algorithm
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Correct answer: (A) The disk arm behaves like an elevator in SCAN algorithm

Explanation

In SCAN, the disk arm moves to one end, then reverses, serving requests along the way, like an elevator. C-SCAN, not SCAN, gives more uniform waiting time.

From DSSSB TGT Computer Science Practice Set 2

This is question 19 of DSSSB TGT Computer Science Practice Set 2. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.