What is a DVD-ROM?

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DVD is an optical disc storage media format that can be used for storing data, including movies with high video and sound quality. DVDs resemble compact discs: their physical dimensions are the same—12cm or the mini 8cm—but they are encoded in a different format and at a much higher density. Unlike CDs, all DVDs must contain a file system. This file system is called UDF, and is an extension of the ISO 9660 Standard used for Data-CDs.