C-look means circular-look. It takes the advantages of both the disk scheduling C-SCAN, and Look disk scheduling. In C-look scheduling, the disk arm moves and service each request till the head reaches its highest request, and after that, the disk arm jumps to the lowest cylinder without servicing any request, and the disk arm moves further and service those requests which are remaining.

Advantages :

• There is no starvation in C-look disk scheduling.
• The performance of the C-Look scheduling is better than Look disk scheduling.
• C-look disk scheduling offers low variance in waiting time and response time.

Disadvantages :

• In C-Look disk scheduling there may be more overhead to determine the end request.
• There is more overhead in calculations.