CUET PG 2026 — operating system os PYQ

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Question

CUET PG 2026 — operating system os PYQ

CUET PG | operating system os | 2026

Assertion (A): The C-SCAN disk scheduling algorithm provides a more uniform wait time compared to the standard SCAN algorithm.

Reason (R): C-SCAN moves the disk head in only one direction across the entire disk, returning directly to the beginning without servicing requests on the return trip.

Choose the correct answer:

Explanation

Assertion (A) is True: In the standard SCAN (Elevator) algorithm, the disk head reverses direction at the ends of the disk. Because requests at the middle cylinders are visited twice as often as requests at the edges, the waiting time for requests near the edges can vary significantly. C-SCAN (Circular SCAN) overcomes this by moving the head in only one direction; when it reaches the end, it immediately returns to the opposite end without servicing any requests. This provides a more uniform and predictable waiting time across all cylinders.
Reason (R) is True: C-SCAN moves the disk head in a single direction across the entire disk and returns directly to the starting end without servicing requests on the return trip, which is the exact mechanism that ensures uniform wait times.
Correct Answer: A. Both A and R are true and R is the correct explanation of A.