Patent ID: 7936653
Filing Date: 2011-05-03
Classification: G11B

Abstract:
1. A recording medium from which information is optically reproduced, comprising: a characteristic information storing region for recording characteristic information indicating a characteristic of the recording medium, said characteristic information storing region being located in a permanent information and control data (PIC) region, and the characteristic information being pre-recorded for determining a L-to-H characteristic or a H-to-L characteristic of the recording medium, wherein the L-to-H characteristic defines that a first reflectance of light reflected by a recorded region of the recording medium is greater than a second reflectance of light reflected by an unrecorded region of the recording medium, and the H-to-L characteristic defines that the first reflectance of light reflected by the recorded region of the recording medium is less than the second reflectance of light reflected by the unrecorded region of the recording medium.