Disc drive device operable with different discs that may exhibit different linear velocities or circumferential recording densities

摘要

An optical disc drive device performs a seek operation during a recording and/or reproducing mode on different discs, such as CDs or MDs, individually loaded thereon, which may differ from one another in linear velocity or circumferential recording density. The linear velocity of a disc is calculated as a function of the number of rotations of a disc spin motor and position information of the pickup head. The number of tracks from a current position of the pickup to a target position is determined by using the address of the target position and the linear velocity of the disc.