Multi-layer optical disc, information recording method and information reproducing method

A method of recording information on an optical disc comprising recording layers, information recording being configured to be performed on the recording layers by forming marks and spaces using a peak power and a prescribed power less than the peak power, the peak power relating to the marks and the prescribed power relating to the spaces, wherein

• the optical disc includes primary parameter information area,
• the primary parameter information area includes primary parameter information relating to a primary ratio of the prescribed power to the peak power, the primary ratio being applied to one of the recording layers,
• the method comprising:
• obtaining the primary parameter information from the primary parameter information area;
• and
• recording information on one of the recording layers using the obtained parameter information.

A method of recording information on an optical disc comprising recording layers, information recording being configured to be performed on the recording layers by forming marks and spaces using a peak power and a prescribed power less than the peak power, the peak power relating to the marks and the prescribed power relating to the spaces, wherein

• the optical disc includes primary parameter information area,
• the primary parameter information area includes primary parameter information relating to a primary ratio of the prescribed power to the peak power, the primary ratio being applied to one of the recording layers,
• the method comprising:
• recording information on the disc.

A method of reproducing information from a single-sided dual-layer optical disc comprising recording layers, information recording being configured to be performed on the recording layers by forming marks and spaces using a peak power and a prescribed power less than the peak power, the peak power relating to the marks and the prescribed power relating to the spaces, wherein

• the optical disc includes primary parameter information area,
• the primary parameter information area includes primary parameter information relating to a primary ratio of the prescribed power to the peak power, the primary ratio being applied to one of the recording layers,
• the method comprising:
• reading management information from the disc;
• and
• reading the recorded information from any of the recording layers.