Optical information recording medium

An optical information recording medium comprising:

• a first transparent substrate including a first smooth surface and a first information surface;
• a first partially reflective film formed on said first information surface which reflects a portion of a first playback beam having a first wavelength and transmits a portion of a second playback beam having a second wavelength;
• a second transparent substrate including a second smooth surface and a second information surface;
• and
• a second reflective film formed on said second information surface which reflects a second playback beam having a second wavelength;
• wherein said second transparent substrate is stacked on said first transparent substrate so that said second smooth surface faces said first information surface such that
• a first information recorded on said first information surface is reproduced by said first playback beam transmitted through said first transparent substrate and second information recorded on said second information surface has a different recording format than said first information surface and is reproduced by said second playback beam transmitted through said first transparent substrate and said second transparent substrate.