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Encyclopedia > Digital Multilayer Disk
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Digital Multilayer Disk (DMD) is an optical disc format developed by D Data Inc. It is based on the Fluorescent Multilayer Disc, which was created by the now defunct company Constellation 3D. This format can store between 22 and 32 GB of binary information. It is based on the red laser technology, so DMD discs and players can be easily made in the existing plants with little modifications. Discs are composed of multiple data layers joined by a fluorescent material. Unlike actual DVDs and CDs, DMD do not have metallic layers, so they are nearly transparent. Each one is coated with proprietary chemical compositions, and those chemicals react when the red laser shines on a particular layer. That chemical reaction generates a signal, which is then read by the disc reader. Like putting more pages in a book and adjusting the font size of the letters, HD-DMD can dramatically increase the storage capacity of a single standard disc. This simple, yet robust technology makes cost effective 20, 50, and even 100 GB discs a reality. Image File history File links Unbalanced_scales. ... The optical lens of a compact disc drive. ... Fluorescent Multilayer Disc (FMD), is an optical disc format developed by Constellation 3D that uses fluorescent, rather than reflective materials to store data. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...


  • A high definition movie requires about 13 GB of store without compression, so it can perfectly fit in a HD-DMD single disc, and there is enough space to add some extra contents such as out-takes, additional scenes, etc.
  • Because HD-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, such as those based on blue laser technology.
  • HD-DMD technology does not ‘stretch’ the limits of science. In the case of technologies based on blue laser, these approaches focus on squeezing more information onto a single layer. And there simply isn’t any more room on the layer to squeeze more data, thereby limiting the capacity of disks using blue laser. To continue with the book analogy, the blue laser alternatives are shrinking the font size to squeeze more words on a page, where as HD-DMD is adding more pages to the book. The primary advantage is that HD-DMD is not constrained in the number of pages it can add to the book, while there is a limit to how small the font size can be for alternatives base on blue laser.
  • HD-DMD is highly scalable. In other words, cost effective 20GB, 50GB, 100GB+ disks are possible with little additional research & development required.
  • HD-DMD enables dramatic improvements in piracy protection, by taking advantage of the multiple layers of information.
  • Now, DData is working on some advances in the development and production of optical heads for disk drives, variable bit-rate encoding, as well as advances in disk production processes

When will be this technology available?

Now, boutique cinemas and other viewing venues in key markets have the first HD-DMD products. Digital Multilayer Disk players, that is, HDTV capacity players require the higher storage capacity of HD-DMD to store sufficient audio and video data to fully utilize the capabilities of HDTV receivers and projectors, enabling full length movies, at high definition, on a single disk. In select US markets you can also find HD-DMD products. HD-DMD will become more broadly available to consumers in 2007.

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Industrial & home video media
Magnetic tape

VERA (1952) - 2 inch Quadruplex videotape (1956) - 1 inch type A videotape (1965) - U-matic (1969) - Cartrivision (1972) - Video Cassette Recording (1972) - V-Cord (1974) - VX (aka "The Great Time Machine") (1974) - Betamax (1975) - 1 inch type B videotape (1976) - 1 inch type C videotape (1976) - VHS (1976) - Video 2000 (1979) - VHS-C (1982) - M (1982) - Betacam (1982) - Video8 (1985) - MII (1986) - D1 (1986) - S-VHS (1987) - D2 (1988) - Hi8 (1989) - D3 (1991) - D5 (1994) - Digital-S (D9) (199?) - S-VHS-C (1987) - W-VHS (1992) - DV (1995) - Betacam HDCAM (1997) - D-VHS (1998) - Digital8 (1999) - HDV (2003) The home video business rents and sells videocassettes and DVDs to the public. ... Compact audio cassette Magnetic tape is a non-volatile storage medium consisting of a magnetic coating on a thin plastic strip. ... VERA (Vision Electronic Recording Apparatus) was an early videotape format developed by the BBC in the 1950s. ... 2 inch Quadruplex (also called 2″ Quad, or just quad, for short) was the first practical and commercially successful videotape format. ... 1 inch type A (designated Type A by SMPTE) is an open-reel videotape format developed by Ampex in 1965, that was one of the first standardized open-reel videotape formats in the 1 inch (25 mm) width (most others of that size at that time were proprietary). ... Sony U-matic VTR BVU-800 A U-matic tape U-matic is the name of a videocassette format developed by Sony in 1969. ... Cartrivision was a videocassette format introduced in 1972, and the first format of its kind available in the USA.[1] It was produced by Cartridge Television, Inc. ... Video Cassette Recording (VCR) was a video format by Philips, the first successful home videocassette recorder system. ... V-Cord was a videocassette format developed and released by Sanyo in 1974. ... VX was a short-lived and unsucessful videocassette format developed by Quasar in 1974. ... Sonys Betamax is the 12. ... 1 inch type B (designated Type B by SMPTE) is an open-reel videotape format developed by Bosch in Germany in 1976. ... 1 inch Type C (designated Type C by SMPTE) is a professional open-reel videotape format co-developed and introduced by Ampex and Sony in 1976. ... Top view of VHS cassette with U.S. 25c coin for scale Bottom view of VHS cassette with magnetic tape exposed Top view of VHS cassette with front casing removed The Video Home System, better known by its abbreviation VHS, is a recording and playing standard for analog video cassette... Video 2000 (or V2000; also known as Video Compact Cassette, or VCC) was a consumer VCR system and videotape standard developed by Philips and Grundig AG to compete with JVCs VHS and Sonys Betamax video technologies. ... VHS-C is the compact VHS format used for portable video recorders. ... M is the name of a professional videocassette format developed around 1982 by Matsushita and RCA. It was developed as a competitor to Sonys Betacam format. ... Sony Betacam-SP VTP BVW-65 Betacam and VHS size comparison Betacam SP L (top), Betacam SP S (left), VHS (right) The early form of Betacam tapes are interchangeable with Betamax, though the recordings are not. ... A Video8 cassette The 8mm video format refers informally to three related videocassette formats for the NTSC and PAL/SECAM television systems. ... Note: The MII video tape format is not to be confused with Panasonics M2 videogame console The official logo for the MII videocassette format (courtesy Panasonic) MII is a professional videocassette format developed by Panasonic in 1986 as their answer & competitive product to Sonys Betacam SP format. ... Sonys D1 format was the first major professional digital video format, introduced in 1987. ... Introduced in Japan in 1987, S-VHS (Super VHS) was an improved version of the VHS standard for consumer video cassette recorders. ... D2 is a professional digital video tape format created by Ampex and other manufacturers through a standards group of the Society of Motion Picture and Television Engineers (SMPTE) and introduced at the 1988 NAB (National Association of Broadcasters) convention as a lower-cost alternative to the D1 format. ... A Video8 cassette The 8mm video format refers informally to three related videocassette formats for the NTSC and PAL/SECAM television systems. ... D3 is a professional digital video tape format. ... Panasonic D5 HD VTR AJ-HD3700H A Cassette Tape for D5 HD(Medium) D5 is a professional digital video format introduced by Panasonic in 1994. ... Digital-S or D-9 is a 4:2:2 digital video format from JVC. It is very similar to DVCPRO50, but records on videocassettes in the S-VHS form factor. ... VHS-C is the compact VHS format used for portable video recorders. ... W-VHS is a high definition analogue video tape format created by JVC. Usually it used to store RGB or composite video at a resolution of 1125 lines on a magnetic tape of the same dimensions as VHS. Categories: Technology stubs | Television stubs | Video storage | VHS ... A MiniDV tape For other uses, see DV (disambiguation). ... Betacam and VHS size comparison Betacam SP L, Betacam SP S, VHS Betacam is a family of half-inch professional videotape formats developed by Sony from 1982 onwards. ... D-VHS logo D-VHS is a digital video format developed by JVC, in collaboration with Hitachi, Matsushita and Philips. ... Digital-8 (or D8) is a consumer digital videotape format developed by Sony in the late 1990s. ... High Definition Video (HDV) is a video format designed to record compressed HDTV video on standard DV media (DV or MiniDV cassette tape). ...

Optical discs

Laserdisc (1978) - Laserfilm (1984) - CD Video - VCD (1993) - DVD (1996) - DVD-Video (1996) - MiniDVD - CVD (1998) - SVCD (1998) - FMD (2000) - EVD (2003) - FVD (2005) - UMD (2005) - VMD (2006) - HD DVD (2006) - Blu-ray Disc (BD) (2006) - DMD (2006?) - AVCHD (2006) - Tapestry Media (2007) - HVD (TBA) - PH-DVD (TBA) - Protein-coated disc (TBA) - Two-Photon 3-D (TBA) The optical lens of a compact disc drive. ... This article or section does not cite its references or sources. ... Laserfilm was a videodisc format developed by McDonnell-Douglas in 1984 that was a transmissive laser-based playback medium (unlike its competitor, laserdisc, which was a reflective system). ... CD Video (also known as CDV, CD-V, or CD+V) was a format introduced in the mid-1980s that combined the technologies of compact disc and laserdisc. ... Video CD (aka VCD, VideoCD, View CD, Compact Disc digital video) is a standard digital format for storing video on a Compact Disc. ... DVD (commonly Digital Versatile Disc, previously Digital Video Disc) is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. ... This article or section does not cite its references or sources. ... There are two types of MiniDVD cDVD, which are 80-mm versions of the 120-mm DVD mini-DVD, which are standard CDs filled with the DVD-video format // cDVD A Mini-DVD-RAM with DVD Round Holder. ... The China Video Disc (CVD), developed in the late 1990s, is a Chinese government-sponsored competitor to the SVCD standard. ... Super Video CD (Super Video Compact Disc or SVCD) is a format used for storing video on standard compact discs. ... Fluorescent Multilayer Disc (FMD), is an optical disc format developed by Constellation 3D that uses fluorescent, rather than reflective materials to store data. ... The Enhanced Versatile Disc (EVD) was announced on November 18, 2003 by Chinas Xinhua news agency as a response to the popular DVD Video format and its licensing costs (which some considered excessive). ... FVD, or Forward Versatile Disc, is an offshoot of DVD developed in Taiwan jointly by the Advanced Optical Storage Research Alliance (AOSRA) and the Industrial Technology Research Institute (ITRI) as a more inexpensive alternative for high-definition content. ... A UMD The Universal Media Disc (UMD) is an optical disc medium developed by Sony for use on the PlayStation Portable. ... Versatile Multilayer Disc (VMD) is a high-capacity red laser optical disc technology designed by New Medium Enterprises, Inc. ... HD-DVD disc HD DVD (for High Density Digital Versatile Disc) is a digital optical media format which is being developed as one standard for high-definition DVD. HD DVD is similar to the competing Blu-ray Disc, which also uses the same CD sized (120 mm diameter) optical data... A Blu-ray Disc is a high-density optical disc format for the storage of digital media, including high-definition video. ... AVCHD (Advanced Video Codec High Definition) is a new high definition recording codec introduced by Sony and Panasonic. ... Info A computer disc about the size of a DVD that can hold 60 times more data will go on sale in 2006, according to its American developer InPhase Technologies, a Lucent spin off. ... Picture of a HVD by Optware. ... There are very few or no other articles that link to this one. ... Protein-Coated Disc (PCD) is a theoretical optical disc technology currently being developed by Professor V Renugopalakrishnan of Harvard Medical School. ... Two-Photon 3-D Optical Data Storage refers to an optical storage system under development by a team at the University of Central Florida. ...

Grooved Videodiscs

SelectaVision (1981) - VHD (1983) Videodisc (or video disc) is a general term for a laser- or stylus-readable random-access circular disc that contains both audio and video signals recorded in an analog form. ... The Hobbit CED SelectaVision was originally the name for a video playback system developed by RCA using specialized Capacitance Electronic Disc (CED) media, in which video and audio could be played back on a TV using a special analog needle and high-density groove system similar to phonograph records. ... VHD is a videodisc format which was marketed predominantly in Japan by JVC. VHD stands for Video High Density, and there was also an audio-only variant called, not surprisingly, AHD. // Technology VHD discs are 25cm in diameter, though the user never sees them as they are stored in caddies...

  Results from FactBites:
Digital Data Storage (4257 words)
Digital signals can be transmitted, stored, and manipulated in a far more precise manner than the older analog technology.
For electro-optical disks, this is the development of materials that have high sensitivity to short-wavelength illumination and advanced multilayered materials that increase storage density per drive.
For example, one new method of recovering data from a disk is called partial-response maximum-likelihood (PRML), a sampling scheme that permits disk manufacturers to dynamically calculate the probability of a given bit of data being a 'one' or a 'zero' from a sampled electrical signal from the disk head.
Chp 3: Emerging Optical Storage Technologies (2252 words)
These approaches include extending present disk system storage technologies to (1) a 3-D layered format; (2) volume holographic encoding, where data is recorded in a distributed fashion in the volume; and (3) wavelength encoding persistent hole-burning, where wavelength or time can be used as the third dimension.
Therefore, the volumetric density is governed by the effective volume of the spot, which in turn is limited by the volumetric resolution of the media, the numerical aperture of the optics, the wavelength, and the positional accuracy of the pickup head in the third dimension.
Layered optical disk storage is presently being investigated (using different approaches and at different levels of development) by Toshiba, Matsushita, and Sony in Japan, and by IBM and Call/ Recall, Inc.
  More results at FactBites »



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