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For a magnetic disk with concentric circular tracks, the seek latency is not linearly proportional to the seek distance due to

1. non-uniform distribution of requests
2. arm starting and stopping inertia
3. higher capacity of tracks on the periphery of the platter
4. use of unfair arm scheduling policies

Correct answer: arm starting and stopping inertia

Solution

The seek latency is affected by the physical limitations of the disk's read/write arm, which experiences inertia when starting and stopping. This means that the time taken to move the arm is not directly proportional to the distance it needs to travel, as it takes additional time to overcome inertia.

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