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The DVD specifications created and updated by the DVD Forum are published as so-called DVD Books (e.g. DVD-ROM Book, DVD-Audio Book, DVD-Video Book, DVD-R Book, DVD-RW Book, DVD-RAM Book, DVD-AR (Audio Recording) Book, DVD-VR (Video Recording) Book, etc.). [1] [2] [3] DVD discs are made up of two discs; normally one is blank, and the other ...
The CD+G format takes advantage of the channels R through W. These six bits store the graphics information. CD + Extended Graphics (CD+EG, also known as CD+XG) is an improved variant of the Compact Disc + Graphics (CD+G) format. Like CD+G, CD+EG uses basic CD-ROM features to display text and video information in addition to the music being played.
The CD-ROM was later designed as an extension of the CD-DA, and adapted this format to hold any form of digital data, with an initial storage capacity of 553 MB. [5] Sony and Philips created the technical standard that defines the format of a CD-ROM in 1983, [6] in what came to be called the Yellow Book.
Both CD-R and DVD-R outperformed all forms of Blu-Ray disc in regards to longevity: the best performing Blu-ray disc, the BD-RE (rewritable Blu-ray) has an average longevity of 20-50 years, while non-rewritable BD-R discs have an average longevity of 10-20 years under ideal conditions. [52] Media of higher quality tends to last longer.
This may be either in audio form or data form . This process is used in the mastering of read-only compact discs. DVDs and Blu-rays use similar methods (see Optical Disc § Optical disc manufacturing). A CD can be used to store audio, video, and data in various standardized formats defined in the Rainbow Books.
CD-ROM represents the CD format, in its pre-recorded "read only" use; DVD+R represents a DVD "+" disc which can be written once only; DVD-RW represents a DVD "-" disc which can be read or written many times; BD-RE represents a Blu-ray disc which can be read or written many times.
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DVD, also known digital versatile disc or digital video disc — an optical disc storage media format, commonly used for commercial movies. DVDs have high visual and sound quality capacities for recording and playback of digital media .
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