Talk:Versatile Multilayer Disc

Technology

How does a vmd store the video? Is there DRM infection?

The technology was originally invented by a company named Constellation 3D. They weren't in the groups of companies forming the DVD Forum or DVD+RW Alliance (I call them the Empire and Rebel Alliance) and they had squat for marketing skills. The company declared bankruptcy and its assets and patents were bought by D-Data Inc. in 2003, which attempted to relaunch C3D's FMD Fluorescent Multilayer Disc as DMD or Digital Multilayer Disc. HD VMD appears to be another re-naming of the technology, this time with some marketing skill behind it- with the simultaneous launch of players and a catalog of movies.

As for how FMD/DMD/HD VMD works, it uses several dye layers, each of which fluoresces when hit by a specific wavelength of red laser light. The drive mechanism is a standard DVD-ROM unit with custom firmware to enable it to focus on more than two distinct layers and to adjust the wavelength of the laser. The prototype discs C3D showed were completely clear, as the fluorescent dyes need no metallized reflective layer. This also allows each layer to be closer in capacity than dual layer DVD/HD-DVD/Blu-Ray discs which use metal to reflect the laser back at the lens. The bottom layer on those discs can't hold as much data as the top layer due to the bottom layer being only partially reflective and some other reasons.

The company behind HD VMD has said they're working on a blue laser version that could push capacity to 200 gigabytes.

Merge?

How about merging the articles on Fluorescent Multilayer Disc, Digital Multilayer Disc and HD-VMD? They're the same technology, based on Constellation 3D's FMD.

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BetacommandBot 07:05, 7 November 2007 (UTC)

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