Discussion
A disk scheduling algorithm in an operating system causes the disk arm to move back and forth across the disk surface in order to service all requests in its path. This is a
Answer: C
Correct answer: Scan
The SCAN algorithm, often called the elevator algorithm, sweeps the arm steadily from one end of the disk to the other and back, serving every request it passes on the way. It avoids the starvation of far-out requests that shortest-seek-time-first can cause, while still moving far less than first-come-first-served.
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