Alternative HD disc formats

HD-DVD and Blu-ray aren't the only HD disc formats out there; there's a handful of alternative formats (mostly based on red lasers) that have tried, or are still trying to get a space on that home entertainment shelf.

HVD (Holographic Versatile Disc)
While it's not exactly a technology that will strictly be used for HD movies, holographic storage might be the next big thing in storage, period. By using holograms to store data on optical discs, up to 2TB of data can be stored on a single disc. And the HVD Forum's roadmap indicates that products with this capacity might be seen as early as the year 2010.

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