Optical disc having indication portion
Optical disc having information pits in form of plurality of fra
Optical disc having information units comprising a plurality of
Optical disc having land pre-pits and variable groove depths
Optical disc having large display patterns and its manufacturing
Optical disc having narrow recording track relative to light...
Optical disc having oscillating land and grooves
Optical disc having oscillating lands and grooves
Optical disc having oscillating lands and grooves
Optical disc having pits in multiple regions and signal processi
Optical disc having pits of different depth formed therein,...
Optical disc having plural grooves of different depths
Optical disc having plural zones of constant density
Optical disc having plural zones of recording tracks
Optical disc having positive marks and negative marks in a...
Optical disc having protective cover
Optical disc having recorded thereon a simplified playback contr
Optical disc having small access units and address...
Optical disc having specified track pitch, push-pull signal,...
Optical disc having square information pits arranged in symmetri