Information recording medium, method of generating flag, method of producing information recording medium, method of adjusting recording conditions of information recording medium, method of recording for information recording medium and information recording device

A method of generating a flag comprising the steps of:

• measuring a first asymmetry value at a first recording power at which a jitter becomes minimum;
• measuring a second asymmetry value at a second recording power which is 0.85 times said first recording power;
• and
• generating a flag indicating whether or not an asymmetry value is available for OPC by comparing said first asymmetry value and said second asymmetry value.

A method of producing an information recording medium on which information is recorded by irradiation with light comprising the steps of:

• producing a confirming recording medium;
• using said confirming recording medium to confirm whether or not an intensity of light for recording can be adjusted on a basis of a correlation between an asymmetry value and said intensity of light;
• and
• producing an information recording medium on which a flag indicating the confirmation result is recorded.

A method of adjusting recording conditions of an information recording medium comprising the steps of:

• measuring a first asymmetry value at a first recording power at which a jitter becomes minimum;
• measuring a second asymmetry value at a second recording power that is 0.85 times said first recording power;
• measuring a difference between said first asymmetry value and said second asymmetry value;
• and
• determining that if a difference between said first asymmetry value and said second asymmetry value is 0.05 or more, said asymmetry value is available for OPC, while if a difference between said first asymmetry value and said second asymmetry value is less than 0.05, said asymmetry value is not available for OPC.

A method of adjusting recording conditions of an information recording medium comprising the steps of:

• measuring a first asymmetry value at a first recording power at which a jitter becomes minimum;
• measuring a second asymmetry value at a second recording power that is 0.85 times said first recording power;
• generating a flag indicating whether or not an asymmetry value is available for OPC by comparing said first asymmetry value and said second asymmetry value;
• and
• adjusting recording conditions based on said generated flag.

A method of recording for an information recording medium on which information is recorded with light, and which contains a flag indicating whether or not an intensity of light for recording information can be adjusted on the basis of a correlation between asymmetry values and said intensity of light, comprising the steps of:

• reading out said flag from said information recording medium;
• if said flag indicates that said adjustment is possible, adjusting said intensity of light based on said correlation;
• and
• recording information on said information recording medium with said light.

An information recording device for recording information on an information recording medium with light, wherein a flag is recorded on said information recording medium, the flag indicating whether or not an intensity of light for recording can be adjusted on the basis of a correlation between an asymmetry value and said intensity of light, comprising:

• a reading section for reading out said flag from said information recording medium;
• a first adjustment section for adjusting said intensity of light on the basis of said correlation between an asymmetry value of said information recording medium and said intensity of light;
• a selecting section for activating said adjustment section when said flag indicates that the adjustment is possible;
• and
• a recording section for recording information on said information recording medium by irradiating said information recording medium with said light.

An information recording device for recording information on an information recording medium by irradiating the information recording medium with light, comprising:

• a first adjustment section for adjusting an intensity of said light on the basis of a correlation between an asymmetry value of said information recording medium and said intensity of said light;
• a signal recording section for recording a first signal on said information recording medium by means of light at a first intensity, while recording a second signal on said information recording medium by means of light at a second intensity;
• a selecting section for determining an asymmetry value of said first signal and an asymmetry value of said second signal and calculating a difference between said asymmetry values, and for activating said adjustment section when said difference is equal to or greater than a reference value;
• and
• a recording section for recording information on said information recording medium by irradiating said information recording medium with said light.