Information recording and reproducing apparatus and information recording medium

An information recording medium in which information can be recorded onto the information recording medium and reproduced or erased therefrom by irradiating the information recording medium with oscillated laser light to form a recorded region in a recording area on the information recording medium, said recorded region being physically different from the region where information has not been recorded, wherein:

• a recording condition comprising at least a linear recording velocity, recording power and amplitude information is previously recorded;
• and
• information about the change ratio of the amplitude to the recording power at said linear recording velocity is previously recorded.

An information recording medium in which information can be recorded onto the information recording medium and reproduced or erased therefrom by irradiating the information recording medium with oscillated laser light to form a recorded region in a recording area on the information recording medium, said recorded region being physically different from the region where information has not been recorded, wherein:

• a recording condition comprising at least plural linear recording velocities, plural recording powers and plural pieces of amplitude information is previously recorded;
• and
• information about the change ratio of the amplitude to the recording power at each of plural linear recording velocities is previously recorded.

An information recording medium in which information can be recorded onto the information recording medium and reproduced or erased therefrom by irradiating the information recording medium with oscillated laser light to form a recorded region in a recording area on the information recording medium, said recorded region being physically different from the region where information has not been recorded, wherein:

• a recording condition comprising at least plural linear recording velocities, plural recording powers and plural pieces of amplitude information is previously recorded;
• and
• information about the change ratio of the amplitude to the recording power at a linear recording velocity in the recording-possible linear recording velocity range and information about the change ratio of the amplitude to the linear recording velocity in the recording-possible linear recording velocity range are previously recorded.