Optical disk having a plurality of information recording units

Optical disk having a recording area on each side and...

Optical disk having a rewritable area and a read-only area

Optical disk having address information in lands and grooves, an

Optical disk having an attribute which designates whether a...

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 clamp portion higher than substrate

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