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What is the VOB ID?

VOB IDs are used in DVD (video) to group together cells (A Cell is a unit used by DVD (video). It is the smallest unit used, and is often used to classify a chapter on a DVD.)found in PGCs (PGC (ProGram Chain) is a unit used by DVD (video). A PGC unit represents a single playback item. For example, the main movie on a DVD is a single PGC, and other items on the DVD such as studio trailers, featurettes, preview trailers will each be a PGC.)