Optical disk testing device and optical disk testing method

Abstract

An optical disk testing device and an optical disk testing method used for indentifying copy protection and physical defect of an optical disk. The method comprises the steps of: judging whether a defect exists or not according to a replay error of the optical disk (10) during data replaying; detecting whether a replay error also occurs in an L1 at the same radius position through a system controller (32) when the replay error occurs in an L0 of a double-layer optical disk; making a determination of copy protection when the replay error does not occur in the L1; and making a determination of physical defect when the replay error also occurs in the L1.

Description

technical field [0001] The invention relates to an optical disc inspection device and an optical disc inspection method, in particular to an optical disc copy protection and defect identification technology. Background technique [0002] Conventionally, an optical disc inspection device that measures the number of errors and error rates of reproduced data to inspect the optical disc is known. [0003] The following Patent Document 1 discloses an optical disc inspection device, which has: a feeding unit that moves the irradiation position of laser light relative to the radial direction of the optical disc; and a defect position detection unit that detects a defect on the recording surface of the optical disc. The position of the inspection radius position setting unit, according to the radius of the defect position detected by the defect position detection unit, sets the radius position when measuring the number of errors or the error rate in the playback data. [0004] Pate...

AI Technical Summary

Problems solved by technology

[0006] When inspecting such a copy-protected optical disc with an inspection device, errors in the reproduced data also occur in the copy-protected portion. Therefore, in an inspection device that judges whether there is a defect by the number of errors or the error rate of the reproduced data, even There are no physical defects such as scratches and pollution that should be detected, and it may be misjudged as a defective disc

[0007] In particular, when discs such as DVDs with recorded content such as movies enter the rental shop, they will be checked for defects by the inspection device. If there is no defect but it is misjudged to be defective, the reliability of the inspection device will be affected.

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