Patent ID: 7573786

Claim:
An optical disk apparatus comprising: a disk motor for rotatably driving an optical disk; a disk motor driving circuit for driving said disk motor; and a controller for controlling said disk motor to control an angular velocity of said optical disk in accordance with a current position of a current I/O operation and a target position of a next I/O operation, said current position being closer to a rim of said optical disk than said target position; when said current position and said target position are located on a first side of a predetermined reference radial position, said controller controls said disk motor in a constant linear velocity mode of said optical disk; and when said current position and said target position are located on a second side of said predetermined reference radial position other than the first side, said controller controls said disk motor in a constant linear velocity mode of said optical disk; and when said current position is located between the rim of said optical disk and said predetermined reference radial position and if said target position is located between said predetermined reference radial position and an axis of rotation of said optical disk, said controller controls said disk motor in a constant angular velocity mode of said optical disk.