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While Sony (Blu-ray) and Toshiba (HD-DVD) go head-to-head with competing high-definition DVD technology, Hitachi-Maxell and InPhase Technologies are working on a disc that will hold 300GB of information, or six times what either of the other discs can store. Hitachi is calling their technology a tapestry holographic disc, but the technology is generally called a holographic versatile disc (HVD), which is slightly larger than a regular DVD.