Consider a disk has 200 cylinders, numbered from 0 to 199. At some time the disk arm is at cylinder 100, and moving towards right direction. There is a queue of disk access requests for cylinders 30, 85, 110, 100, 105, 126, 135, 55 and 195. The difference in the distance that will be traversed by the R/W head when the LOOK algorithm is used compared to the CSCAN algorithm is ________.
Please also mention the method of C-SCAN.