Optical disk capable of inhibiting from rental use

Optical disk capable of recording information on both groove and

Optical disk capable of recording information on both land and g

Optical disk capable of storing information data at difference c

Optical disk carrier with write-protect mechanism

Optical disk carrying tracking information in multiple formats a

Optical disk cartridge

Optical disk cartridge

Optical disk cartridge

Optical disk cartridge

Optical disk cartridge

Optical disk cartridge and cooperating apparatus

Optical disk cartridge assembly

Optical disk cartridge assembly

Optical disk cartridge having disk thickness sample plate

Optical disk case assembly

Optical disk compatible with read-only disk and having...

Optical disk compatible with two different reading systems

Optical disk comprising a positional information section and...

Optical disk copy-protection using an optically changeable...