Holographic Versatile Disc (HVD) has already been approved by ECMA and JEITA and the first version of the media will hold 200GB and a technology path that has already been proven to be capable of 1TB (1,000GB or 200 standard DVDs).
http://www.audioholics.com/techtips/specsformats/HVDHolographicVersatileDis.php
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