DVD (Digital Versatile Disc) — is an information storage medium. Superficially, it looks like a disc and resembles a compact disc (CD), but has a greater storage capacity because of shorter laser wave implication as to compare to CD.

DVD-Video — one of the DVD formats for storage of video and audio materials.

DVD-R (DVD+R) — recordable DVD discs with the storage capacity of 4.7 Gb. This are write-once discs.

DVD-RW (DVD+RW) — are rewritable DVD discs with the storage capacity of 4.7 Gb. Data can be rewritten multiple number of times.

DVD-R DL (DVD+R DL) — are recordable DVD discs with the storage capacity of 8.5 Gb. Both represent write-once formats.

The difference between DVD-R and DVD+R is that they come in two different incompatible formats. The difference lies mainly in the way data is written to them and not in the way it is played. Currently, most DVD recorders can use both formats for data recording. DVD-R was created and is supported by DVD Forum standard group that comprises about 200 Asian, European and American companies. DVD+R is a creation of DVD+RW Alliance consisting of several top range companies like Sony and Philips.

DVD5 — is just one of the names for a single-layer DVD disc with the storage capacity of 4.7 Gb.

DVD9 — is just one of the names for a dual-layer DVD disc with the storage capacity of 8.5 Gb.

Layer Break — is the sector where a dual-layer DVD switches from the first layer to the second layer.

ISO-9660 — is a file system standard for optical disc media.

UDF (Universal Disk Format) — is a file system specification independent from the operating system intended for data storage on optical media. UDF format is expected to replace ISO-9660 in the future. However, DVD-Video discs use UDF Bridge Format (a combination of Micro-UDF and ISO-9660) to ensure data consistency.

DDP (Disc Description Protocol) — is a format for specifying the content of optical discs and is preferable format for replication manufacturers. This format specifies collection of data including the content of an optical disc, the files describing the format/structure and any other additional data.

MPEG-2 — is a collection of standards that coordinates the encryption of multiple forms of digital multimedia (video and audio signals), coordinates video and audio as well as streams that carry multiple programs.

Disc image (source master) — is a single file or storage medium containing the complete contents and structure of a DVD disc. Most common is an ISO of DVD-Videos containing a UDF Bridge Format file system that is a combination of Micro-UDF and ISO-9660.

Replication — is a technology of CD, DVD and other optical media production. It might also be referred to as a disc pressing. As opposed to duplication technology, the data is not burnt or copied to a disc, but rather discs are pressed or replicated from a stamper in a factory setting.

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