Question

Suppose the head of a moving head disk with 200 tracks, numbered 0 to 199, is

currently serving a request at track 143 and has just finished a request at track 125.If the

queue of requests is kept in FIFO order: 86, 147, 91, 177, 94, 150, 102, 175, 130. What is

the total head movement to satisfy these requests for the following disk scheduling

algorithms?

(a) FCFS (b) SCAN (c) SSTF (d) C- SCAN ​

Answer 1

option 2

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Answer 2

The correct answer is:

Explanation:

• (a) FCFS: 565.

(143 → 86 → 147 → 91 → 177 → 94 → 150 → 102 → 175 → 130)

• (b) SSTF: 162.

(143 → 147 → 150 → 130irighrarrow102 → 94 → 91 → 86 → 175 → 177)

• (c) SCAN: 169.

(143 → 147 → 150 → 175 → 177 → 199 → 130 → 102 → 94 → 91 → 86)

• (d) LOOK: 125.

(143 → 147 → 150 → 175 → 177 → 130 → 102 → 94 → 91 → 86)