Optical disc

Optical disc

Optical disc

Optical disc

Optical disc

Optical disc base plate and process for producing the same

Optical disc having signal recording layer on each side and meth

Optical disc with corrosion-resistant metallic reflective layer

Optical disc with inhibited thermal distortion

Optical disk

Optical disk

Optical disk

Optical disk

Optical disk and recording/reproducing device

Optical disk employing integral substrate, and method for...

Optical disk having a hard coat layer

Optical disk having R/W and worm area

Optical disk substrate

Optical disk substrate

Optical disk substrate