Abstract: An optical disk apparatus includes a disk servo unit which generates a servo signal based on a data signal read from an optical disk. The servo signal is supplied to a disk motor to control a rotation of the motor so that a linear velocity of the disk is kept constant when data is read from or written onto the disk. The disk servo unit is connected to the motor when the data is read from or written onto the disk, so that the servo signal is supplied to the motor, and the disk servo unit is disconnected from the motor when a pickup jumps from a present track of the disk to a destination track thereof so that the supply of the servo signal to the motor is inhibited. A velocity change signal which enables the motor to increase or decrease a rotating speed of the motor is generated depending on which one of two directions of the track jump is specified by a direction signal.