Patent ID: 7924691

Claim:
An information storage medium storing modulated data, wherein the modulated data has a channel bit length T, the modulated data has a minimum inversion length and a maximum inversion length, the minimum inversion length corresponds to 2T, the modulated data is configured to be reproduced by a reproducing apparatus, the modulated data is configured to produce a reproduction signal when the reproducing apparatus reproduces the modulated data, a high level of a reproduction signal amplitude is a highest level reproduced from an area having the maximum inversion length, a low level of a reproduction signal amplitude is a lowest level reproduced from an area having the maximum inversion length or reproduced from an emboss area having the maximum inversion length, a differential value is defined as a difference between the high level value and the low level value, and a ratio of the differential value to the high level value is more than 0.2.