Optical disk having an evaluation pattern for evaluating the opt

Optical disk having an evaluation pattern for evaluating the opt

Optical disk having an evaluation pattern for evaluating the opt

Optical disk having an index mark

Optical disk having an SiO.sub.2 coating

Optical disk having areas of different recording densities...

Optical disk having data stored on a land portion and a groove p

Optical disk having first and second recording areas with wobble

Optical disk having first design visible from one side of the di

Optical disk having groove address pits and land address...

Optical disk having high recording density

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 pattern displayed thereon and apparatus for

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