In the C-SCAN disk scheduling algorithm, the disk arm is required to move in one direction only until it reaches the last track or there are no more requests to service in that direction, then it reverses direction and the scan proceeds in the opposite direction in the same fashion.

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In the C-SCAN (Circular SCAN) disk scheduling algorithm, the disk arm moves in one direction only, servicing requests until it reaches the last track, then it immediately returns to the first track without servicing any requests on the return path, and continues the scan in the same direction.

In the C-SCAN Disk Scheduling Algorithm, the Disk Arm Is