DVD glossary

Oil Stain

Organic residues under the metallic coating

One Off

A finalized CD-R. May also refer to a CD-R proof, or test, disc generated after premastering.

Orange Book

Proprietary multipart Philips/Sony specification (orange cover) for magneto-optical, CD-R, and CD- RW optical discs.

Opposite track
Dual layer disc where layer 0 and layer 1 have opposite track directions. Layer 0 reads from the inside to outside of disc, whereas Layer 1 reads from the outside to the inside. The disc always spins clockwise, regardless of track structure or layers. This mode facilitates movie playback by allowing seamless transition from one layer to another.

Optical Output
In the case of DVD, this connection is used to connect the DVD digital output to a surround sound processor via a TOSLINK cable to process DVD sound (Dolby Digital).

Outer diameter
Width of the disc. This is 12 cm for "normal" CDs and DVDs, and 8 cm for small CDs and DVDs.