What is the main difference between LOOK and SCAN disk scheduling?

Options

  • A. LOOK goes only up to the last pending request before reversing, while SCAN goes to the disk end
  • B. LOOK always selects the closest request
  • C. SCAN does not reverse direction
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

A. LOOK goes only up to the last pending request before reversing, while SCAN goes to the disk end

Detailed Explanation

Explanation: LOOK is similar to SCAN, but the head does not travel all the way to the physical end of the disk unless there is a request there. It reverses direction after servicing the last request in the current direction, reducing unnecessary head movement.

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