The present invention recognizes that induced RRO is coherent, i.e., the
RRO has a large degree of repeatability from track to track. The present
invention is a zero acceleration profile (compensation) process that
targets CRRO (Coherent RRO). A process of the present invention
represents a considerable reduction in the factory calibration time
compared to other compensation techniques currently used. The reduction
in time is attributed to the fact that CRRO can be computed by averaging
position error signals (PES) over multiple tracks as opposed to total RRO
which is computed by averaging over multiple revolutions on the same
track.