There is a block of 200 cylinders to be accessed, numbered 0 to 199. The disk arm is currently on cylinder 100 and was previously on cylinder 130. Given the disk request order of 186, 67, 91, 177,...

os

• first come first serve


• shortest seek time first


• LOOK


• which one is more efficient? Explain

Extracted text: There is a block of 200 cylinders to be accessed, numbered 0 to 199. The disk arm is currently on cylinder 100 and was previously on cylinder 130. Given the disk request order of 186, 67, 91, 177, 124, 50, 102, 175, 30. Illustrate the disk arm movement pattern when the following algorithms are used and calculate the total disk arm movements with regards to cylinders.