DRIVE DEVICE, INFORMATION PROCESSING DEVICE, MASS ECCENTRICITY ACQUIRING METHOD AND INFORMATION PROCESSING METHOD

摘要

The time required to start the operation of recording or reproducing an optical disk is shortened. A measured value of mass eccentricity is stored in a mass eccentricity table (41) in association with each optical disk identification information. An optical disk identifying unit (31) acquires identification information on an optical disk (1) on the basis of information read from the optical disk (1) mounted on an optical disk device. When the measured value of mass eccentricity associated with the acquired identification information is stored in the mass eccentricity table (41), the mass eccentricity acquiring unit (32) reads the measured value and outputs the read measured value as control information necessary for controlling the operation of recording or reproducing the optical disk (1). When the measured value of mass eccentricity associated with the acquired identification information is not stored in the mass eccentricity table (41), a mass eccentricity measuring unit (33) measures the mass eccentricity by rotating the optical disk (1), and the mass eccentricity acquiring unit (32) outputs the acquired measured value as the control information.