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Toshiba has submitted a triple-layer, 51GB HD DVD-ROM disc to the standard's overseer in the hope the technology will be adopted as a standard by the end of the year. If approved, it allow the format to exceed the 50GB storage capacity of rival medium Blu-ray Disc. The HD DVD standard currently defines single- and dual-layer discs capable of holding 15GB and 30GB of data, respectively. That's plenty, say the format's supporters, for a movie encoded in 1080p HD resolution and a stack of extras.