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Digital Multilayer Disk
) is an optical disc
In computing and optical disc recording technologies, an optical disc is a flat, usually circular disc which encodes binary data in the form of pits and lands on a special material on one of its flat surfaces...
format developed by D Data Inc. It is based on the 3D optical data storage
3D optical data storage is the term given to any form of optical data storage in which information can be recorded and/or read with three dimensional resolution ....
technology developed for the Fluorescent Multilayer Disc
Fluorescent Multilayer Disc was an optical disc format developed by Constellation 3D that uses fluorescent, rather than reflective materials to store data. Reflective disc formats have a practical limitation of about two layers, primarily due to interference, scatter, and inter-layer cross talk...
by the defunct company Constellation 3D
Constellation 3D was a company developing a new optical medium, the Fluorescent Multilayer Disc and Card .The company was shut down following a failure to receive a committed investment by a Swiss based investor and the unavailability of other financial sources...
. DMDs can store between 22 and 32 GB of binary information. It is based on red laser technology, so DM discs and players can be easily made in existing production facilities with little modifications. Discs are composed of multiple data layers joined by a fluorescent material. Unlike DVD
A DVD is an optical disc storage media format, invented and developed by Philips, Sony, Toshiba, and Panasonic in 1995. DVDs offer higher storage capacity than Compact Discs while having the same dimensions....
s and CDs
The Compact Disc is an optical disc used to store digital data. It was originally developed to store and playback sound recordings exclusively, but later expanded to encompass data storage , write-once audio and data storage , rewritable media , Video Compact Discs , Super Video Compact Discs ,...
, DMD do not have metallic layers, so they are nearly transparent. DMDs are coated with proprietary chemical compositions, and those chemicals react when the red laser shines on a particular layer. The chemical reaction then generates a signal, which is then read by the disc reader. This allows for discs to potentially have up to 100 GB of storage space.
- A high definition movie requires about 13 GB of storage with compression, so it can fit in an HD-DMD single disc, and there is enough space to add additional content and features.
- Because DMD only requires a stable, reliable red laser to read information from the disk, the manufacturing processes for both disks and drives is much simpler and much less expensive than other alternatives, like Blu-ray or HD DVD
HD DVD is a discontinued high-density optical disc format for storing data and high-definition video.Supported principally by Toshiba, HD DVD was envisioned to be the successor to the standard DVD format...
- DMD is highly scalable meaning 20GB, 50GB, 100GB+ disks are possible with little additional research & development required.