Patent ID: 8363518

Claim:
A disk drive for performing servo control of tracking of an optical pickup on an optical disk, the disk drive comprising: a rotation phase detecting unit for detecting a rotation phase of the optical disk; an eccentric amount detecting unit for detecting an eccentric amount of the optical disk for each prescribed rotation phase detected by the rotation phase detecting unit; a storage unit for storing, for individual prescribed rotation phases, the eccentric amounts for one round of the optical disk detected by the eccentric amount detecting unit; a setting unit for determining, from the eccentric amounts for individual prescribed rotation phases for one round of the optical disk read out of the storage unit, a rotation phase range in which a lens shift amount after tracking pulling-in of an object lens constituting the optical pickup does not exceed a movable range of the object lens in a preset tracking direction, and for setting the rotation phase range as a tracking pulling-in range; and a control unit for carrying out tracking pulling-in of the optical pickup while the rotation phase of the optical disk detected by the rotation phase detecting unit is placed within the tracking pulling-in range set by the setting unit, wherein the disk drive can maximize pulling-in capability for eccentricity even in initial tracking pulling-in.