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 »  Home  »  Glossary  »  G
G

G
Giga. An SI prefix for denominations of 1 billion (109).

G byte
One billion (109) bytes. Not to be confused with GB or gigabyte (230 bytes).

Galaxy Group
The group of companies proposing the Galaxy watermarking format. (IBM/NEC, Hitachi/Pioneer/Sony.)

GB
Gigabyte.

Gbps
Gigabits/second. Billions (109) of bits per second.

General Parameters (GPRMs)
GPRMs are used to store the users operational history and to modify a players behavior. DVD-Video players have 16 unique GPRMs. Each GRPM may store a fixed length, two-byte numerical value.

gigabyte
1,073,741,824 (230) bytes.

Glass Mastering
Part of the CD and DVD disc manufacturing process that uses a laser (which is modulated by the data to be stored on the disc) to expose areas of a photo-resist layer on a glass disc, where the final pits are required. These areas are then developed and the photo resist layer metallised so that stampers can be grown by electroforming using this metal layer. The stampers are then used for moulding CD and DVD discs.

Green Book
Specification defining the CD-interactive (CD-i) standard. (See also Blue Book, Orange Book, Red Book, White Book and Yellow Book)

gsm
Grams per Square Metre. The standard system in Europe describing the weight of paper - how heavy 1 square metre of paper is in grams. The higher the number the 'thicker' the paper, e.g. company stationery may be printed on 90gsm paper, whereas CD wallets may be printed on 300gsm card.