Directions (Q96–100): Consider the following disk queue with requests for I/O to blocks on cylinders:
45, 81, 185, 33, 175, 99, 150, 77
(Consider that the head starts from location 58.)
What shall be the total head movement of cylinders for the C-SCAN disk scheduling technique if the head starts moving in the right direction from the initial position? (Assume cylinders 0–199)
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Correct answer: D. 385
Explanation
C-SCAN goes right from 58 to the last cylinder 199 (141 cylinders), returns to 0 (199), then moves up to 45 (45). Total = 141 + 199 + 45 = 385.More System Software and Operating System questions
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