Patent ID: 7924673
Filing Date: 2011-04-12
Classification: G11B

Abstract:
1. An optical disk device for processing specific information recorded on a recording medium, comprising: a reading unit for reading the specific information recorded on the recording medium; a characteristic identification unit for identifying a reflection characteristic of the recording medium; and a processing unit for processing the specific information according to the identified reflection characteristic, wherein the reflection characteristic indicates that the recording medium has a first characteristic or a second characteristic, the first characteristic being that a reflectance of light reflected by a recorded region of the recording medium, defining a first reflectance, is greater than a reflectance of light reflected by an unrecorded region of the recording medium, defining a second reflectance, the second characteristic being that the first reflectance is less than the second reflectance, and the processing unit includes a threshold changing unit for changing a threshold for detecting a defective portion of the recording medium, on the basis of the identified reflection characteristic and a light reflection level corresponding to the identified reflection characteristic.