A disk head is initially at cylinder 50. The FCFS request sequence is 60, 90, 30, 20. What is the total head movement?
Options
- A. 100 cylinders
- B. 110 cylinders
- C. 120 cylinders
- D. More than one of the above
- E. None of the above
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Correct Answer (Detailed Explanation is Below)
C. 120 cylinders
Detailed Explanation
Formula: |60-50| + |90-60| + |30-90| + |20-30| = 10 + 30 + 60 + 10 = 110 cylinders.
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