A disk head is initially at cylinder 100. The FCFS request sequence is 55, 20, 80. What is the total head movement?
Options
- A. 135 cylinders
- B. 145 cylinders
- C. 155 cylinders
- D. More than one of the above
- E. None of the above
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Correct Answer (Detailed Explanation is Below)
B. 145 cylinders
Detailed Explanation
Formula: |55-100| + |20-55| + |80-20| = 45 + 35 + 60 = 140 cylinders.
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