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HD DVD ('''High Density Digital Versatile Disc''' or '''High Definition Digital Video Disc''') is a digital optical media format which is being developed as one standard for 2006, Microsoft announced that there will be an external add-on HD DVD drive for the Xbox 360 game console, due sometime this year. At the Las Vegas CES 2006, "companies backing HD DVD said that nearly 200 titles would be available for the format by the end of the year." {Link without Title} On , 2006 . {Link without Title} OVERVIEW HD DVD has a single layer capacity of 15 , Video Codec 1 (VC1, based on the Windows Media 9 format) and H.264/MPEG-4 AVC . {Link without Title} HISTORY On November 19 , 2003 , the DVD Forum decided with a seven-to-eight vote that the HD DVD will be the HDTV successor of the DVD. At this meeting they renamed it to HD DVD, while it had been previously called the "Advanced Optical Disc" (AOD). Blu-ray Disc was developed outside of the DVD Forum , and was never submitted to the forum for consideration. This is however a not very surprising extension of the previous DVD-R/RW versus DVD+R/RW war, where - (dash) was the format defended by DVD Forum , and + (plus) the format defended by the DVD+RW Alliance . The DVD Forum generally has focus on CE (Consumer Electronic) and Japanese market development (where CE happens to be very strong). The DVD+RW Alliance has invested more on the PC market with technologies such as Background Formatting and defect management through "Mount Rainier" (unreleased). The current specification version for HD DVD-ROM and HD DVD-Rewritable is version 1.0. The specification for HD DVD-R is currently at 0.9. The first HD DVD-ROM drives were expected to be unveiled by Q4 2004 , with mass production to start in Q1 2005 . The actual product launch of both CE and PC units occurred in 2006. COMMON DISC STRUCTURE There are many advantages to the fact that HD DVD discs will be the same size as current DVD discs. Backward Compatibility will be available with all HD DVD players allowing consumers to only require a single player in their homes to play both HD DVD and DVD discs. DVD disc replication companies can continue using their current production equipment with only minor alterations when changing over to the format of HD DVD replication. Due to the structure of the single-lens optical head, both red and blue laser diodes can be used in smaller, more compact HD DVD players. Additionally there is a hybrid HD DVD which contains both DVD and HD DVD versions of the same movie on a single disc, providing smoother transition for the studios in terms of publishing the movies. THE BLUE LASER HD DVD uses a blue-violet 405 Nm laser to read information from the disc (DVDs use red 650 nm lasers). , DVD , Blu-ray Disc , HD DVD ]] The shorter Wavelength reduces Diffraction and maintains a smaller spot size of the laser. This allows data to be read from a higher density on the disc surface. While DVDs and HD DVDs will be the same size physically, the ability to store data at a higher density results in a larger total data capacity in HD. COPY RESTRICTION TECHNOLOGY Commercialized HD DVDs will integrate copy restriction technology that is expected to be developed by AACS LA ( Advanced Access Content System License Administrator). "Audio Watermark Protection" is also being created for use on HD DVD. All HD DVD players will have a sensor that listens for inaudible watermarks in the soundtrack of movies, and will be included in the soundtracks of all major movies. If a DVD player detects the code, the disc must be a copy made by copying a film to video, or using a camcorder and microphone on a cinema screen and will cause the player to refuse to play the disc. The mark is made by varying the waveform of speech and music in a regular pattern to convey a digital code. These variations, while being too subtle to be heard by the human ear, can easily be neutralized by the HD DVD players as well as by audio editing software. Another variation of this system can be used to prevent the playback of discs created by using a camcorder and microphone on a home entertainment center playing a legitimate disc purchased by a consumer. This variation for home entertainment utilizes a watermark that differs from the cinema mark that the player will be able to use to check whether the disc is authorized or not. Manufacturers have also discussed plans to make players accessible for online monitoring like a digital cable box; any attempt to Crack a machine, play a cracked disc, or another region's disc would disable the machine. In addition, HD DVD players must follow , 5 of the 6 studios releasing HD DVD content have announced they will not use ICT/down-conversion for the time being {Link without Title} . AACS guidelines require that any title that implements the ICT must clearly state so on the packaging. INTERACTIVE CONTENT HD DVDs will use the IHD Interactive Format to allow interactive content to be authored for discs. In contrast, Blu-ray makes use of Java technology for its interactive content. FIRST RELEASED MOVIES The first HD DVD movies released on the 18th April , 2006 are '' The Last Samurai '', '' Million Dollar Baby '', '' The Phantom Of The Opera '' by Warner Home Video ; and '' Serenity '' by Universal Studios {Link without Title} {Link without Title} . FIRST RELEASED PLAYERS On April 18th, 2006, Toshiba released the first HD-DVD player for the United States, the Toshiba HD-A1 and Toshiba HD-XA1 . They are reported to be sold-out in many stores nationwide. SEE ALSO
Alternative Disc Technologies
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