Optical record carrier
Optical record medium
Optical recording card and method of producing the same
Optical recording device
Optical recording disc
Optical recording disk
Optical recording disk
Optical recording disk
Optical recording disk
Optical recording disk
Optical recording disk
Optical recording disk and production process therefor
Optical recording element
Optical recording element
Optical recording element with ROM and recording regions
Optical recording elements
Optical recording layers containing sulfur
Optical recording material
Optical recording material
Optical recording media