For a magnetic disk with concentric circular tracks, the seek latency is not linearly proportional to the seek distance due to
(A) non-uniform distribution of requests
(B) arm starting and stopping inertia
(C) higher capacity of tracks on the periphery of the platter
(D) use of unfair arm scheduling policies
Explanation: Whenever head moves from one track to other then its speed and direction changes, which is noting but change in motion or the case of inertia. So answer B
This explanation has been contributed by Abhishek Kumar.