The new ROM disc released by To****ba Cor****ation has a three-layer
structure, with each layer storing 17GB of data. The advances capacity
over current ROM discs, which hold 15GB of data in each layer of a
single-sided disc. Continued improvement in disc mastering technology
has achieved..
http://askwiki.blogspot.com/2007/01/51gb-triple-layer-hd-dvd-rom-disc.html
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