Multiple choice

An imaginary disk has 55 cylinders. If disk head on a cylinder is 25, find the number of disk moves using first come first serve [FCFS] algorithm. The new requests are as follows: 5, 45, 10, 30, 21, 42, 35

  1. 152

  2. 150

  3. 155

  4. 160

  5. 145
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A Correct answer
Explanation

(25 - 5) + (45 - 5) + (45 - 10) + (30 - 10) + (30 - 21) + (42 - 21) + (42 - 35) = 152

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