Presently, there are forms of holographic data storage that store more than typical Blu-Ray discs and are estimated to cost less than USD $1 to manufacture. (sources: http://en.wikipedia.org/wiki/Holographic_Versatile_Card and http://techon.nikkeibp.co.jp/english/NEWS_EN/20050608/105586/)
The players and recorders are incredibly expensive at this point in time, but that's rating them for IMMEDIATE release. Not in another two or three years. Blu-Ray was just as expensive initially, and part of what has kept it expensive is low adoption rates due to its failure to present a vast, distinct advantage over DVD. Don't get me wrong; I'd love a Blu-Ray player. However, most consumers don't see it as presenting a significant enough advantage.
Given that a single, original-prototype HVD disc holds in excess of 500GB and is theorized to hold as much as 4TB, this will be able to present a much more significant advantage. Such as possibly being the technology that we still use in another 50 years (source: http://en.wikipedia.org/wiki/Holographic_data_storage#Longevity).
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