Optical recording medium, recording/reproducing method and recording/reproducing apparatus

A method of recording data on an optical recording medium formed of a plurality of recording layers, the method comprising:

• recording in one of the recording layers a predetermined reference signal at an optimum recording condition determined for optimum recording and/or reproducing operations in a recording layer in which data is to be recorded among the plurality of recording layers;
• and
• recording reference signal indicator information, indicating information on the recording layer in which the reference signal is recorded, in a recording signal information area of the recording layer in which data is first recorded.

A method of recording data on an optical recording medium formed of a plurality of recording layers, the method comprising:

• recording in one of the recording layers a predetermined reference signal at an optimum recording condition determined for optimum recording and/or reproducing operations in a recording layer in which data is to be recorded among the plurality of recording layers;
• and
• recording reference signal indicator information, indicating information on the recording layer in which the reference signal is recorded, in a recording signal information area of a recording layer that is to be a reference.

A method of reproducing data from an optical recording medium formed of a plurality of recording layers, the method comprising:

• reading reference signal indicator information from at least one layer of the optical recording medium, the reference signal information indicating information on each recording layer in which a reference signal is recorded at an optimum recording condition;
• and
• determining from the reference signal indicator information, recording layers in which the reference signal is recorded.

An apparatus for recording data on an optical recording medium formed of a plurality of recording layers, the apparatus comprising:

• a writing unit recording data on the medium;
• and
• a control unit controlling the writing unit to record a predetermined reference signal in one of the plurality of recording layers at an optimum recording condition determined for optimum recording and/or reproducing operations, and to record reference signal indicator information, indicating information on the one of the plurality of recording layers in which the reference signal is recorded, wherein the one of the plurality of recording layers is a first layer to be recorded i.

An apparatus for recording data on an optical recording medium formed of a plurality of recording layers, the apparatus comprising:

• a writing unit recording data on the medium;
• and
• a control unit controlling the writing unit to record a predetermined reference signal in a reference recording layer among the plurality of recording layers at an optimum recording condition, and to record reference signal indicator information, indicating information on the reference recording layer.

An apparatus for reproducing data from an optical recording medium formed of a plurality of recording layers, the apparatus comprising:

• a reading unit reading data from the medium;
• and
• a control unit controlling the reading unit to read reference signal indicator information from the recording medium, the reference signal information indicating information on each recording layer in which a reference signal is recorded in a reference signal area at an optimum recording condition determined for optimum recording and/or reproducing operations for one or more of the recording layers, and determining, from the reference signal indicator information, recording layers in which the reference signal is recorded.