Abstract: An optical disc drive which can at least read out data from an optical disc is disclosed. The optical disc drive comprises a rotational drive mechanism for rotating the loaded optical disc at a predetermined rotation speed which is one of multiple rotation speed levels; an optical pick-up for reading out data from the optical disc which is rotated by the rotational drive mechanism; a judgement device for making a judgement as to whether the data has been properly read out from a predetermined portion of the optical disc; and a retry control device for lowering the rotation speed of the optical disc from the predetermined rotation speed when the judgement device has judged that the data has not been properly read out from the portion of the optical disc, and then for retrying to read out the data from the same portion of the optical disc rotating at the lowered rotation speed.

Abstract: An object of this invention is to provide a disk player in which a plurality of disks different in diameter are driven, and can be identified with high accuracy. Disclosed is the disk player, a digital signal processing section applies to a CPU a synchronization signal which is raised to high level when the frequency of a detection signal outputted by a laser pickup reaches a predetermined value which permits a data reading operation, and a sense signal which is raised to high level when the frequency of the detection signal is shifted from a predetermined frequency. The CPU operates to rotate a spindle motor, and to brake the latter when the synchronization signal is raised to high level. The CPU further operates to detect a period of time which lapses from the time instant the motor is braked until the sense signal is fallen to low level, and to identify the loaded disk from the period of time thus detected.