Information storage medium, recording method, and recording apparatus

A reproducing method for reproducing modulated data from an information storage medium, 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,
• the reproducing method comprising:
• irradiating the information storage medium with a focused light;
• and
• reproducing the modulated data recorded on the information storage medium based on a reflection of the light.

A recording method for recording modulated data on an information storage medium, 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,
• a ratio of the differential value to the high level value is more than 0.2,
• the recording method comprising:
• irradiating the information storage medium with a focused light;
• and
• recording modulated data on the information storage medium based on the light.

A reproducing apparatus for reproducing modulated data from an information storage medium, 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,
• a ratio of the differential value to the high level value is more than 0.2,
• the reproducing apparatus comprising:
• an optical head for irradiating the information storage medium with a light and for producing the reproduction signal;
• and
• a slicer unit relating to the reproduction signal.