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Digital Versatile Disc (or Digital Video Disc) is an optical disc medium that uses one of a set number of software formats to store content on the disc for data retrieval or video player playback. Some DVDs are capable of recording once (DVD+R, DVD-R) and other discs are capable of being rewritten multiple times (DVD+RW, DVD-RW). In addition, a dual-layer disc (DVD+R DL, DVD-R DL) is capable of storing twice the amount of data. A typical DVD stores 4.7 GB of data on a single layer.