Patent ID: 8531931

Claim:
An optical disk inspecting apparatus configured to inspect presence or absence of a defect in an optical disk, the apparatus comprising: a reproduction unit configured to produce reproduction data based on reflected light when the optical disk is irradiated with laser light while being rotated and which can execute high-speed reproduction of playing the optical disk at a first rotation speed and low-speed reproduction of playing the optical disk at a second rotation speed lower than the first rotation speed; an error information calculating unit configured to calculate, based on the reproduction data, information on an error contained in the reproduction data to produce error information; and a control unit configured to control the drive of the reproduction unit and the drive of the error information calculating unit and also configured to determine, based on the error information, presence or absence of a defect in the optical disk, wherein the control unit is configured to execute: preliminary extraction processing for causing the reproduction unit to execute the high-speed reproduction and also preliminarily extracting, based on the error information or RF amplitude provided during the high-speed reproduction, a segment which has a high possibility of including a defect; and low-speed principal determination processing for causing the reproduction unit to execute the low-speed reproduction in the preliminarily extracted segment among segments where the high-speed reproduction is executed and also performing principal determination on presence or absence of a defect based on the error information provided during the low-speed reproduction.