Question
A disk scheduling system receives requests for the
following cylinders: 98, 183, 37, 122, 14, 124, 65, 67. If the current position of the disk head is at cylinder 53, and the system uses the SCAN algorithm, which cylinder is serviced immediately after 65?Solution
The SCAN algorithm moves the disk head in one direction, servicing all requests until it reaches the end, then reverses direction. 1. Initial direction: upwards. 2. Sequence of servicing: 65 → 67 → 98 → 122 → 124 → (reverses) → 37 → 14. 3. After servicing 65, the next request in the upward direction is 67. Why Other Options Are Incorrect: • B) 14 & C) 37: These are serviced after the head reverses direction. • D) 98 & E) 122: These are serviced later in the upward direction, but after 67.
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