DVD glossary

Galois Field

Mathematical concept where the elements of the binary field GF(2^m) are represented by 2^m m-bit binary bytes, each expressible by an m-bit column vector. For example, GF(2⁸) contains 256 eight-bit bytes. Named for the brilliant French mathematician Evariste Galois who developed the concept in the early 1830's. Killed in a duel at the age of 25, his work was unknown until Liouville published Galois' papers in 1846.

GB

Gigabyte, 1 GB equals 2³⁰ bytes or 1024 megabytes. Or, 1 GB may equal 10⁹ bytes. Gb may denote gigabits.

Glass Master

Data image of the final CD or DVD disc generated by a Laser Beam Recorder (LBR), normally consisting of a thin photosensitive organic layer supported by a polished, optically flat glass substrate.

Green Book

Proprietary Philips/Sony specification (green cover) for CD-i.

Groove

Continuous, spiraled trench-like radial guidance track of a recordable or rewritable disc offset towards the entrance surface that defines track centerline for recording purposes and contains CLV clocking, addressing, and other information.

Glitch
A noticeable audio or visual anomaly during DVD playback.

GOP
Group of Pictures.