C-SCAN (Cont) queue=98,183,37,122,14,124,65,67 head starts at 53 37536567 98122124 183199 Applied Operating System Concepts Silberschatz, Galvin, and Gagne @1999
13.11 Silberschatz, Galvin, and Gagne ©1999 Applied Operating System Concepts C-SCAN (Cont.)
C-LOOK ●∨ ersion of c- SCAN C-SCAN算法的一种形式 Arm only goes as far as the last request in each direction, then reverses direction immediately, without first going all the way to the end of the disk.磁臂在每个方向上仅仅移动到最 远的请求位置,然后立即反向移动,而不需要移动到磁盘的 端 Applied Operating System Concepts 13.12 Silberschatz, Galvin, and Gagne @1999
13.12 Silberschatz, Galvin, and Gagne ©1999 Applied Operating System Concepts C-LOOK • Version of C-SCAN C-SCAN算法的一种形式。 • Arm only goes as far as the last request in each direction, then reverses direction immediately, without first going all the way to the end of the disk. 磁臂在每个方向上仅仅移动到最 远的请求位置，然后立即反向移动，而不需要移动到磁盘的一 端