Self Doubt Disk Scheduling

Question

Suppose a disk has 100 cylinders, numbered from 0 to 99. At some time the disk arm is at cylinder 20, and there is a queue of disk access requests for cylinders 10, 22, 6, 38, 2, 40, 20. 

No of seeks in

1. FCFS
2. SSTF

Comments

Yes

It is FCFS ,so head come to $20$,but other than FCFS,head is not come,because it start from $20$

Is this correct?

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Yes, depends on the policy used. like in SSTF 20 is processed first.

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Yeah thanks