Optical disk having identification signal recorded between and u

Optical disk having individual recognizing function

Optical disk having information pits of different lengths and sh

Optical disk having information pits with projections formed the

Optical disk having intertrack heat conduction suppression

Optical disk having lands and grooves with a reduced track...

Optical disk having logical tracks and dummy sectors in each zon

Optical disk having narrow and wide guide grooves

Optical disk having pattern displayed thereon and apparatus for

Optical disk having pattern for tilt detection

Optical disk having pits of different depths formed therein,...

Optical disk having pits with push-pull signal of opposite polar

Optical disk having playback parameters recorded thereon and met

Optical disk having plurality of volumes, recording device...

Optical disk having predetermined cross-track signal, cross-trac

Optical disk having radial lands and grooves, and boundary...

Optical disk having read-exclusive and write-enable regions

Optical disk having read-only and rewritable areas with overlapp

Optical disk having read-only and rewritable areas with...

Optical disk having readable information on both sides of...