Suppose a disk drive has 6000 cylinders, numbered 0 to 5999.
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Suppose a disk drive has 6000 cylinders, numbered 0 to 5999.
The drive is currently serving a request at cylinder 250, and the previous request was at cylinder 200.
The disk arm is currently moving in an increasing direction (towards higher cylinder numbers).
The queue of pending requests, in FIFO order, is: 1800, 4000, 2000, 4500, 300, 120, 3500, 1500, 4800, 1800, 900.
Calculate the total head movement (in cylinders) if the disk follows the LOOK scheduling algorithm.
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Step-by-step Derivation:
Step 1: Formulate problem conditions.
Step 2: Apply logical deduction.
Step 3: Conclude correct option.