Head positioning controller for information recording and/or reproducing apparatus with head tracking of nonsynchronous radial runout (NRRO) of the disk

摘要

An apparatus is constructed to record and/or reproduce information through a head on or from a disk which is an information recording medium. The apparatus has a first driving motor for supporting and rotationally driving the disk; a second driving motor for supporting and rotationally driving the head; a detection unit for detecting a nonsynchronous deflection component of a rotating part of the first driving motor; and a control unit for controlling the second motor, based on detection of the detection unit, so as to make the head track the nonsynchronous deflection component.