 | |
 Data side of an HD DVD | |
| Media type | High-densityoptical disc |
|---|---|
| Encoding | VC-1,H.264, andMPEG-2 |
| Capacity | 15 GB (single layer) 30 GB (dual layer) |
| Read mechanism | 405 nm laser: 1× @ 36 Mbit/s & 2× @ 72 Mbit/s |
| Write mechanism | 405 nm laser: 1× @ 36 Mbit/s & 2× @ 72 Mbit/s |
| Developed by | |
| Usage | Data storage,1080phigh-definition video |
| Extended from | DVD,DVD-Video |
| Extended to | Blu-ray Disc |
| Released | March 31, 2006 (2006-03-31) |
| Discontinued | March 28, 2008 (2008-03-28) (1 year, 11 months and 28 days) |
HD DVD (short forHigh Density Digital Versatile Disc)[1] is an obsolete high-densityoptical disc format for storing data and playback ofhigh-definition video.[2][3][4][5][6] Supported principally byToshiba, HD DVD was envisioned to be the successor to the standardDVD format, but lost out toBlu-ray, which was supported bySony and others.
HD DVD employed ablue laser with a shorter wavelength (with the exception of the3× DVD and HD REC variants), and it stored about 3.2 times as much data per layer as its predecessor (maximum capacity: 15 GB per layer compared to 4.7 GB per layer on a DVD). The format was commercially released in 2006 and fought a protractedformat war with rivalBlu-ray. On February 19, 2008, Toshiba abandoned the format,[7] announcing it would no longer manufacture HD DVD players and drives.[2] The HD DVD Promotion Group was dissolved on March 28, 2008.[8]
The HD DVD physical disc specifications (but not thecodecs) were used as the basis for theChina Blue High-definition Disc (CBHD) formerly called CH-DVD.
Besides recordable and rewritable variants, a HD DVD-RAM variant was proposed as the successor to theDVD-RAM and specifications for it were developed,[9] but the format never reached the market.
In the late 1990s, commercialHDTV sets started to enter a larger market, but there was no inexpensive way to record or play back HD content.JVC'sD-VHS andSony'sHDCAM formats could store that amount of data, but were neither popular nor well-known.[10] It was known that using lasers with shorter wavelengths would yield optical storage with higher density.Shuji Nakamura invented practicalblue laserdiodes, but a lengthy patent lawsuit delayed commercial introduction.[11]
Sony started two projects applying the new diodes:UDO (Ultra Density Optical) and DVR Blue together with Philips, a format of rewritable discs which would eventually become Blu-ray Disc (more specifically, BD-RE) and later on with Pioneer a format of read only discs (BD-ROM).[12] The two formats share several technologies (such as the AV codecs and the laser diode). In February 2002, the project was officially announced as Blu-ray Disc,[13] and theBlu-ray Disc Association was founded by the nine initial members.
TheDVD Forum (chaired by Sony) was deeply split over whether or not to go with the more expensive blue lasers. Although today's Blu-ray Discs appear virtually identical to a standard DVD, when the Blu-ray Discs were initially developed they required a protectivecaddy to avoid mis-handling by the consumer (early CD-Rs also featured a protective caddy for the same purpose.) The Blu-ray Disc prototype's caddy was both expensive and physically different from DVD, posing several problems.[14] In March 2002, the forum voted to approve a proposal endorsed by Warner Bros. and other motion picture studios that involved compressing HD content onto dual-layerDVD-9 discs.[15][16] In spite of this decision, the DVD Forum's Steering Committee announced in April that it was pursuing its own blue-laser high-definition solution. In August, Toshiba and NEC announced their competing standard Advanced Optical Disc.[17] It was adopted by the DVD forum and renamed to HD DVD the next year.[18]
The HD DVD Promotion Group was a group of manufacturers and media studios formed to exchange thoughts and ideas to help promote the format worldwide.[19] Its members comprised Toshiba as the Chair Company and Secretary, Memory-Tech Corporation andNEC as Vice-Chair companies, andSanyo Electric as Auditors; there were 61 general members and 72 associate members in total.[20] The HD DVD promotion group was officially dissolved on March 28, 2008, following Toshiba's announcement on February 19, 2008 that it would no longer develop or manufacture HD DVD players and drives.
Much like thevideotape format war betweenVHS andBetamax, HD DVD was competing with a rival format,Blu-ray Disc.
In an attempt to avoid a costly format war, the Blu-ray Disc Association and DVD Forum attempted to negotiate a compromise in early 2005. One of the issues was that Blu-ray Disc companies wanted to use a Java-based platform for interactivity (BD-J based onSun Microsystems'Java TV standards), while HD DVD companies wanted to use Microsoft's "iHD" (which becameHDi).[21] Another problem was the physical formats of the discs themselves.[22] The negotiations proceeded slowly and ultimately stalled.[23]
On August 22, 2005, the Blu-ray Disc Association and DVD Forum announced that the negotiations to unify their standards had failed.[24] Rumors surfaced that talks had stalled; publicly, the same reasons of physical format incompatibility were cited.[22][25] By the end of September that year,Microsoft and Intel jointly announced their support for HD DVD.[26]
Hewlett-Packard attempted to broker a compromise between the Blu-ray Disc Association and Microsoft by demanding that Blu-ray Disc use Microsoft'sHDi instead of BD-J and threatening to support HD DVD instead.[27] The Blu-ray Disc Association did not agree to HP's demands.[28]
On March 31, 2006, Toshiba released their first consumer-based HD DVD player in Japan at¥110,000 (US$934).[29]HD DVD was released in the United States on April 18, 2006,[30] with players priced at $499 and $799.
The first HD DVD titles were released on April 18, 2006. They wereThe Last Samurai,Million Dollar Baby, andThe Phantom of the Opera byWarner Home Video andSerenity byUniversal Studios.[31] The first independent HD film released on HD DVD wasOne Six Right.[32][33]
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In December 2006Toshiba reported that roughly 120,000 Toshiba branded HD DVD players had been sold in the United States, along with 150,000 HD DVD add-on units for theXbox 360.[34]
On April 17, 2007, one year after the first HD DVD titles were released,[30] the HD DVD group reported that they had sold 100,000 dedicated HD DVD units in the United States.[35]
In the middle of 2007, the first HD DVD recorders were released in Japan.[36]
In November 2007, the Toshiba HD-A2 was the first high-definition player to be sold at a sale price of less than $100. This was done through several major retailers to make room for the new HD-A3 models. These closeout sales lasted less than a day each due to both limited quantities and high demand at that price point. In the same month, the HD DVD promotion group announced that 750,000 HD DVD players had been sold, which included stand-alone players and theXbox 360 add-on.[37]
In January 2008 Toshiba announced that close to one million dedicated HD DVD players had been sold.[38]
As of June 24, 2008, 475 HD DVD titles had been released in the US.[39] As of April 29, 2008, 236 HD DVD titles had been released in Japan.[40] Approximately 232 were released in the UK.[citation needed]
On January 4, 2008, citing consumer confusion and indifference as a reason for lackluster high-definition software sales, Warner Bros. publicly announced it would stop supporting HD DVD by June 2008, and the company would release HD titles only on Blu-ray Disc.[41] This was followed by news ofNetflix phasing out support for the format, andBest Buy's decision to recommend Blu-ray Disc over HD DVD in its retail locations and to remove HD DVD players as part of its ongoing "HDTV advantage" promotion. Finally, retailerWal-Mart announced that it would be supporting onlyBlu-ray Disc by June 2008.
On February 19, 2008, Toshiba announced plans to discontinue development, marketing and manufacturing of HD DVD players while still providing product support and after-sale service to consumers of the format (including firmware updates), effectively making the platform obsolete. The company cited "recent major changes in the market".[42][3][4][5][6] Shipments of HD DVD machines to retailers were reduced and eventually stopped by the end of March 2008.[43] Toshiba later revealed that they lost about $986 million on the format's failure.[44]
The final HD DVD major-studio releases in the United States were Paramount'sInto the Wild, Warner'sP.S. I Love You andTwister, on May 27, 2008. In June, the final HD DVD,Freedom: 6, was released by Bandai Visual, which acknowledged the demise of HD DVD, but stated that it wanted to complete the release of the seven-partFreedom Project, of which six parts had been released.[45] The seventh part, due for August 2008, never saw a release.Disco Pigs was announced but postponed, with no new date announced for release.[46]Pan's Labyrinth is also notable asNew Line Cinema's only film to be released on HD DVD, as the studio quickly shifted to Blu-ray.
Death Proof was released on HD DVD format as a special-release steelbook by Senator Films in Germany on December 15, 2008.[47]
On April 3, 2010,Engadget reported that Anthem Films would release the filmDeadlands 2: Trapped on HD DVD in a limited run of 500 copies. This eventually happened in the form of HD DVD-Rs.[48]Deadlands: The Rising, announced on September 5, 2010, was released on HD DVD in limited numbers. As with the previously releasedDeadlands 2: Trapped, the film was pressed on HDDVD-R disc.[49]
In mid-2009, Warner offered to replace any HD DVD Warner home video release with a Blu-ray Disc equivalent for $4.95, plus $6.95 shipping to the contiguous United States or $8.95 to Alaska, Hawaii or Puerto Rico.[50] The deal required the HD DVD's original sleeve art to be returned to Warner as proof of purchase. The turnaround time for processing was approximately two weeks. Multi-disc sets were exchangeable at a discount, such as $14.95 for the five-discBlade Runner release rather than $24.75. No exchanges were offered to customers outside the United States.
An HD DVD has a capacity of 15,076,554,752 bytes. A dual-layer HD DVD (HD DVD+R/+RW DL or /DVD-R/-RW DL) can store 33,393,473,536 bytes. This capacity is used by the file contents and a small part is used by thefile system overhead and by file names and folder names. The file structure on a HD DVD-Video would start at the VIDEO and AUDIO folders on a HD DVD-Video disc. This would be the case for HD DVD-Video regular (Single layer (SL))/HD DVD-Video DL (Dual layer).[51]
| Name | Make | Type | Date of release | Max Resolution |
|---|---|---|---|---|
| HD-E1 | Toshiba | HD-DVD/DVD player | 15 October 2006, UK Only | 1080i |
| HD-EP10 | Toshiba | HD-DVD/DVD player | 8 June 2007, UK Only | 1080p |
| HD-EP30 | Toshiba | HD-DVD/DVD player | 5 November 2007, UK Only | 1080p |
| HD-EP35 | Toshiba | HD-DVD/DVD player | 19 November 2007, UK Only | 1080p |
| HD-XE1 | Toshiba | HD-DVD/DVD player | 15 October 2006, UK Only | 1080p |
| HD-A1 | Toshiba | HD-DVD/DVD player | 18 April 2006 | 1080i |
| HD-XF2 | Toshiba | HD-DVD/DVD player | 2007 | 1080i |
| HD-XA1 | Toshiba | HD-DVD/DVD player | 18 April 2006 | 1080i |
| HDV5000 | RCA | HD-DVD/DVD player | June 2006 | 1080i |
| HD-D1 | Toshiba | HD-DVD/DVD player | 2006 | 1080i |
| HD-D2 | Toshiba | HD-DVD/DVD player | 1080i | |
| HD-A2 (also known as HD-E1) | Toshiba | HD-DVD/DVD player | 2006 Q4 | 1080i |
| HD-A20 | Toshiba | HD-DVD/DVD player | 7 January 2007 | 1080p |
| HD-XA2 | Toshiba | HD-DVD/DVD player | 2006 Q4 | 1080p |
| HD-D3 | Toshiba | HD-DVD/DVD player | November 2007 | 1080i |
| HD-A3 | Toshiba | HD-DVD/DVD player | November 2007 | 1080i |
| HD-A30 | Toshiba | HD-DVD/DVD player | September 2007 | 1080p |
| HD-A35 | Toshiba | HD-DVD/DVD player | October 2007 | 1080p |
| VARDIA RD-A600 | Toshiba | HD DVD/Regular DVD/HDD-based DVR | June 2007, Japan Only | 1080p |
| VARDIA RD-A301 | Toshiba | HD DVD/Regular DVD/HDD-based DVR | December 2007, Japan Only | 1080i |
| VARDIA RD-A300 | Toshiba | HD DVD/Regular DVD/HDD-based DVR | June 2007, Japan Only | 1080p |
| VARDIA RD-A1 | Toshiba | HD DVD/Regular DVD/HDD-based DVR | July 2006, Japan Only | 1080p |
| DV-HD805 | Onkyo | HD-DVD/DVD player | fall 2007 | 1080p |
| DHS-8.8 | Integra | HD-DVD/DVD player | winter 2007 | 1080p |
| SHD7000 | Venturer | HD-DVD/DVD player | end of 2007[52] | 1080i |
| SHD7001 | Venturer | HD-DVD/DVD player | UK Only | 1080i |
| SHD7500 | Venturer | HD-DVD/DVD player | Cancelled | |
| BH100 | LG | HD DVD/Blu-ray combo player | 7 January 2007 | 1080p |
| BH200 | LG | HD DVD/Blu-ray combo player | October 2007 | 1080p |
| BD-UP5000[53] | Samsung | HD DVD/Blu-ray combo player | 1080p | |
| BD-UP5500 | Samsung | HD DVD/Blu-ray combo player | Cancelled | 1080p |
| Name | Make | Type | Date of release | Sample Mfr Mo & Yr |
|---|---|---|---|---|
| HR-0205T | Asus | HD DVD-ROM drive | 2008-Jan-01 | |
| HDV-ROM2.4FB | Buffalo Technology | PC drive | 2006-Oct-10 | |
| BRHC-6316FBS-BK | Buffalo Technology | Internal Blu-ray Writer, HD DVD Reader | 2008-Apr | |
| BRD-SH6B | I-O Data | Internal DVD Writer, Blu-ray & HD DVD Reader | 2008-Aug-06 | |
| GGC-H20L | LG | Internal DVD Writer, Blu-ray & HD DVD Reader (with LightScribe) | Jul-2008 | |
| GGC-H20N | LG | Internal DVD Writer, Blu-ray & HD DVD Reader (without LightScribe) | ||
| GGW-H10NI | LG | Internal Blu-ray Writer, HD DVD Reader | ||
| GGW-H20L | LG | Internal Blu-ray Writer, HD DVD Reader (with LightScribe) | Jul-2008 | |
| GGW-H20N | LG | Internal Blu-ray Writer, HD DVD Reader (without LightScribe) | ||
| HR-1100A | NEC | Internal HD DVD-ROM drive (OEM usage only) | ||
| PX-B300SA | Plextor | Internal DVD Writer, Blu-ray & HD DVD Reader | ||
| PX-B920SA | Plextor | Internal Blu-ray Writer, HD DVD Reader | 2008-Mar | |
| SD-H802A | Toshiba | HD DVD-ROM drive [IDE/PATA Interface] | 2008-Jan | |
| SD-H902A | Toshiba | HD DVD Writer PC drive | ||
| SD-H903A | Toshiba | HD DVD Writer PC drive |
| Name | Make | Type | Date of release |
|---|---|---|---|
| TS-L802A | Toshiba | Slim HD DVD Reader + DVD Writer Combo PC drive (p/n G8CC0003172v P000480620[54][55] | |
| SD-L802B | Toshiba | Slim HD DVD Reader + DVD Writer Combo PC drive (OEM usage only) | |
| SD-L803A | Toshiba | Slim HD DVD Reader + DVD Writer Combo PC drive (OEM usage only) | December 2007 |
| SD-L902A | Toshiba | Slim HD DVD Writer PC drive HD DVD-R, HD DVD-R DL[56] (OEM usage only) (OEM p/n P000486270[57] Used in the Qosmio PQG40A-00Y014[58] | Mfr'd May 2007[59] - Oct 2007[60] |
| SD-L912A | Toshiba | Slim HD DVD-ReWritable Drive. HD DVD-RW and HD DVD-R DL writer. (Used optionally in the Qosmio G40 and standard in the G45-AV690)[61][62][63][64] |
| Name | Make | Type | Date of release | |
|---|---|---|---|---|
| ZEBRA | Addonics | External Blu-ray Disc & DVD Writer, HD DVD Reader | November 2008 | |
| BRHC-6316U2 | Buffalo Technology | External USB2.0 Blu-ray Disc Rewriter, HD DVD Reader | April 2008 | |
| hd100 | HP | External HD DVD-ROM drive | ||
| BRD-UXH6 | I-O Data | External Blu-ray Disc Rewriter and HD DVD-ROM drive with USB 2.0 | 2008/8/6 | |
| BE06LU10 | LG | External USB2.0 Blu-ray Disc Rewriter, HD DVD Reader[65] | ||
| BE06LU11 | LG | External USB2.0 Blu-ray Disc Rewriter[66] HD DVD reader capability only by aftermarket crossflashing.[67] | ||
| Xbox 360 add-on external HD DVD drive | Microsoft |
| November 2006 | |
| AluWRITER Blu-ray | One technologies | External USB2.0 Blu-ray Disc Rewriter, HD DVD Reader | September 2009 | |
| SW-5583/SW-5583T | OWC | External Blu-ray Disc & DVD Writer, HD DVD Reader | November 2008 | |
| PX-B920UF | Plextor | External Blu-ray Disc Rewriter and HD DVD-ROM drive with USB 2.0 | October 2008 | |
| PA3530U-1HD1 | Toshiba | External slim HD DVD ROM USB 2.0 |
| Name | Make | Type | Date of release |
|---|---|---|---|
| HP Pavilion PC series | HP | Desktop Computer (can be customised to include combo HD DVD-ROM/Blu-ray Disc-RW) | |
| Medion Akoya MD8828 | Medion | Desktop Computer (supports both HD DVD and Blu-ray Disc) | 16 November 2007 |
| MSI GX600-08 | MSI | Laptop Computer with HD DVD-ROM Drive | |
| MSI GX610 | MSI | Laptop Computer with HD DVD-ROM Drive | |
| MSI GX710 | MSI | Laptop Computer with HD DVD-ROM Drive | |
| Qosmio G30 | Toshiba | Laptop Computer with HD DVD-ROM Drive | |
| Qosmio G35 | Toshiba | Laptop Computer with HD DVD-ROM Drive | 16 May 2006 |
| Qosmio G40 | Toshiba | Laptop Computer with HD DVD-R or HD DVD-RW drive | |
| Qosmio G45 | Toshiba | Laptop Computer with HD DVD-R or HD DVD-RW drive | |
| Qosmio F40 | Toshiba | Laptop Computer with HD DVD-R or HD DVD-RW drive | |
| Qosmio F45 | Toshiba | Laptop Computer with HD DVD-ROM drive | |
| Dynabook TX/68E | Toshiba | Laptop Computer with HD DVD-ROM drive | |
| Polywell Minibox 780G | Polywell | PC Complete System (Internal Blu-ray Disc & DVD Writer, HD DVD Reader) | August 2008 |
| Satellite X200 series | Toshiba | Laptop Computer with HD DVD-R drive | |
| Satellite P200 series | Toshiba | Laptop Computer with HD DVD-ROM drive | |
| Satellite A200 series | Toshiba | Laptop Computer with HD DVD-ROM drive | |
| HP Pavilion dv6500/6600t series | HP | Laptop Computer (optional HD DVD drive) | |
| HP Pavilion dv6700t series | HP | Laptop Computer (optional HD DVD-R or Blu-ray drive) | |
| HP Pavilion dv9000 series | HP | Laptop Computer (optional HD DVD-ROM drive) | |
| HP Pavilion dv9500/9600t series | HP | Laptop Computer (optional HD DVD-R drive) | |
| HP Pavilion dv9700t series | HP | Laptop Computer (optional HD DVD-R or Blu-ray drive) | |
| HP Pavilion HDX series | HP | Laptop Computer (optional HD DVD-ROM or Blu-ray drive) | 26 July 2007 |
| G2S | ASUS | Laptop Computer (supports both HD DVD and Blu-ray) | |
| Lamborghini VX2S | ASUS | Laptop Computer (optional HD DVD-ROM drive) | |
| W2W | ASUS | Laptop Computer (optional HD DVD-ROM drive) | |
| C-System E8200 | C-System | PC Complete System (Internal BD & DVD Writer, HD DVD Reader) | June 2008 |
| Shuttle XPC G5 6801M | Shuttle Inc. | Mini-PC Complete System (Internal Blu-ray Disc & DVD Writer, HD DVD Reader) | April 2008 |
| Aspire 5110 | Acer | Laptop Computer (standard HD DVD-ROM drive) | |
| Aspire 5710 | Acer | Laptop Computer (standard HD DVD-ROM drive) | |
| Aspire 5720 | Acer | Laptop Computer (standard HD DVD-ROM drive) | |
| Aspire 5920 | Acer | Laptop Computer (standard HD DVD-ROM drive) | |
| Aspire 7720 | Acer | Laptop Computer (standard HD DVD-ROM drive) | |
| Aspire 9510 | Acer | Laptop Computer (standard HD DVD-ROM drive) | |
| Aspire 9520 | Acer | Laptop Computer (standard HD DVD-ROM drive) | |
| Aspire 9810 | Acer | Laptop Computer (standard HD DVD-ROM drive) | |
| Ferrari 5000 | Acer | Laptop Computer (optional HD DVD-ROM drive) | |
| Predator | Acer | PC Complete System (Internal Blu-ray Disc & DVD Writer, HD DVD Reader) | June 2008 |
| Pegasus series | Rock | Laptop Computer (standard HD DVD-ROM drive for all laptops) | |
| Xtreme series | Rock | Laptop Computer (standard HD DVD-ROM drive for all laptops) | |
| VidaBox MAX and VidaBox LUX | VidaBox | Home Theater PC with HD DVD/Blu-ray combo reader[68] | |
| LifeStation HD | Passive Technologies | Home Theater PC with HD DVD/Blu-ray combo reader | 2007 |
| Mini HD:Hub | Kinetic | Home Theater PC (supports Blu-ray Disc/HD DVD-ROM & DVD-ReWriter, optional Blu-ray Disc Writer) | 2009 UK Only |
| Home HD:Hub | Kinetic | Home Theater PC (supports Blu-ray Disc/HD DVD-ROM & DVD-ReWriter, optional Blu-ray Disc Writer) | 2009 UK Only |
| X HD:Hub | Kinetic | Home Theater PC (supports Blu-ray Disc/HD DVD-ROM & DVD-ReWriter, optional Blu-ray Disc Writer) | 2009 UK Only |
Toshiba-branded HD DVD players use open source software such asLinux as theGPL appears in the manuals.[69][70]
The current specification books for HD DVD are listed at the DVD FLLC website.[71]
HD DVD-ROM, HD DVD-R and HD DVD-RW have a single-layer capacity of 15 GB, and a dual-layer capacity of 30 GB. HD DVD-RAM has a single-layer capacity of 20 GB.[72] Like the original DVD format, the data layer of an HD DVD is 0.6 mm below the surface to physically protect the data layer from damage. Thenumerical aperture of the optical pick-up head is 0.65, compared with 0.6 for DVD. All HD DVD players are backward compatible with DVD and CD.[73]
| Physical size | Single layer capacity | Dual layer capacity |
|---|---|---|
| 12 cm (4.7 in), single sided | 15 GB | 30 GB |
| 12 cm (4.7 in), double sided | 30 GB | 60 GB |
| 8 cm (3.1 in), single sided | 4.7 GB | 8.5 GB |
| 8 cm (3.1 in), double sided | 9.4 GB | 18.8 GB |
| Drive speed | Data rate | Write time for HD DVD (minutes) | ||
|---|---|---|---|---|
| Mbit/s | MB/s | Single Layer | Dual Layer | |
| 1× | 36 | 4.5 | 56 | 110 |
| 2× | 72 | 9 | 28 | 55 |
As with previous optical disc formats, HD DVD supports severalfile systems, such asISO 9660 andUniversal Disk Format (UDF). All HD DVD titles use UDF version 2.5 as the file system. In this file system,multiplexed audio and video streams are stored inEVOcontainer format.[74]
The HD DVD format supports encoding in up to 24-bit/192 kHz for two channels, or up to eight channels of up to 24-bit/96 kHz encoding.[75]
All HD DVD players are required to decode uncompressedlinear PCM,Dolby Digital AC-3,Dolby Digital EX,DTS,Dolby Digital Plus E-AC-3 andDolby TrueHD.[76] A secondary soundtrack, if present, can be stored in any of the aforementioned formats, or in one of the HD DVD optional codecs:DTS-HD High Resolution Audio andDTS-HD Master Audio. For the highest-fidelity audio experience, HD DVD offers content-producers the choice of LPCM, Dolby TrueHD and DTS-HD Master Audio.
HD DVD video can be encoded usingVC-1,H.264/MPEG-4 AVC, orH.262/MPEG-2 Part 2.[citation needed] A wide variety of resolutions are supported, from low-resolutionCIF, allSDTV resolutions supported by DVD-Video, andHDTV formats:720p,1080i, and1080p.[75] All studio-released movie titles have featured video in a 1080-line format, with companion supplements in480i or480p. The vast majority of releases were encoded with VC-1, and most of the remaining titles encoded withH.264/MPEG-4 AVC.
If a publisher wishes to restrict use of its HD DVD content, it may use the Advanced Access Content System (AACS) although this is not required for normal disc playback. AACS is a standard forcontent distribution anddigital rights management. It is developed byAACS Licensing Administrator, LLC (AACS LA), aconsortium that includesDisney,Intel, Microsoft,Panasonic, Warner Bros.,IBM, Toshiba andSony. One of the advantages overCSS, the content restriction system for DVDs, is that AACS allows content providers to revoke an individual player device model if its cryptographic keys have been compromised (meaning that it will not be able to decrypt subsequently released content). There is noRegion Coding in the existing HD DVD specification, which means that titles from any country can be played in players in any other country.
Since appearing in devices in 2006, several successful attacks have been made on the format. The first known attack relied on thetrusted client problem. In addition, decryption keys have been extracted from a weakly protected player (WinDVD). Notably, aProcessing Key was found that could be used to decrypt all HD content that had been released at the time.[77] The processing key was widely published on the Internet after it was found and the AACS LA sent multipleDMCA takedown notices with the aim of censoring it.[78] This caused trouble on some sites that rely on user-submitted content, likeDigg andWikipedia, when administrators tried to remove any mentions of the key.[79][80]
AACS has also been circumvented bySlySoft with their programAnyDVD HD, which allows users to watch HD DVD movies on non-HDCP-compliant PC hardware. SlySoft has stated that AnyDVD HD uses several different mechanisms to disable the encryption, and is not dependent on the use of a single compromised encryption key.[81]Other AACS circumvention programs have become available, like DVDFab HD Decrypter.[82]
HD DVDs useAdvanced Content to allow interactive content to be authored for discs. Microsoft's implementation of Advanced Content is theHDi Interactive Format, and "HDi" is frequently used to refer to the Advanced Content system. Advanced Content is based on web technologies such asHTML,XML,CSS,SMIL, andECMAScript (JavaScript), so authoring in Advanced Content should be a fairly easy transition for web developers. No existing DVD authoring experience is required. In comparison, Blu-ray Disc content is authored using either a scripting environment (BDMV) or a Java-based platform (BD-J). DVD video discs use pre-rendered MPEG segments, selectable subtitle pictures, and simple programmatic navigation which is considerably more limited.
Backward compatibility is available with all HD DVD players, allowing users to have a single player to play all types of HD DVD, DVD and CD. There is also a hybrid HD DVD format which contains both DVD and HD DVD versions of the same movie on a single disc, providing a smooth transition for the studios in terms of publishing movies, and allowing consumers with only DVD players to still use the discs. DVD 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. However, HD DVD discs can't be played on standard DVD players.
HD DVD drives can also be used with a desktop/laptop (notebook computer) or personal computer (PC (like a desktop or portable/luggable)) runningWindows XP,Windows Vista,Mac OS X v10.5 "Leopard", and many varieties ofLinux. Third-party player software for Windows and Linux have successfully played HD DVD titles using the add-on drive.[83]
Released at the end of November 2006, theMicrosoft HD DVD drive for theXbox 360 game-console gives the Xbox 360 the ability to play HD DVD movies. The drive was announced with anMSRP of US$199 and includes aUSB 2.0 cable for connection to the console. The first drives also included Peter Jackson'sKing Kong or Christopher Nolan'sBatman Begins on HD DVD. The final "regular" for the drive was US$129.99 as of February 25, 2008. On February 23, 2008 Microsoft discontinued the Xbox 360 HD DVD player. On February 26, 2008, Microsoft "officially" announced that the Xbox 360 HD DVD add on drive would reflect a heavily discounted price down to $49.99.[84]
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In 2007,LG andSamsung released standalone consumer players that could read both HD DVD and Blu-ray Discs.[a] The machines were sold at premium prices, but failed to sell in large quantities. In May 2008, both companies announced they would stop manufacturing dual-compatibility drives.[85]
A few computer manufacturers (such asHP andAcer) sold computers with combination HD DVD/Blu-ray Disc drives. LG marketed a Blu-ray writer that also read HD DVD discs (but could not write to them).[86][87]
HD DVD competed primarily with Blu-ray Disc. Both formats were designed as successors toDVD, capable of higher quality video and audio playback, and of greater capacity when used to store video, audio, and computer data. Blu-ray Disc and HD DVD share most of the same methods of encoding media onto discs with each other, resulting in equivalent levels of audio and visual quality, but differ in other aspects such as interactive capabilities, internet integration, usage control and enforcement, and in which features were mandatory for players. The storage size also varies: A dual-layer HD DVD holds a maximum of 30 GB of data, while a dual-layer Blu-ray Disc carries 50 GB.
Even after finalizing the HD DVD standard, engineers continued developing the technology. A 51 GB triple-layer spec was approved at the DVD Forums 40th Steering Committee Meeting (held on November 15, 2007).[88] No movies had been scheduled for this disc type, and Toshiba had declined to say whether the 51 GB disc was compatible with existing drives and players. Specification 2.0 Part 1 (Physical Specification) for triple layer HD DVD had been approved in November 2007.[89]
At theCES 2007,Ritek revealed their high definition optical disc process that extended both competing high definition formats to ten layers, increasing capacity to 150 GB for HD DVD and 250 GB for Blu-ray Disc. A major obstacle to implementing this technology in either format (150 GB HD DVD will not be developed due to HD DVD's discontinuation) is that reader-writer technology available may not be able to support the additional data layers.[90]
NEC,[91]Broadcom,[92]Horizon Semiconductors, andSTMicroelectronics[92] have separately developed a single chip/laser that can read both the HD DVD and the Blu-ray Disc standard. Broadcom and STMicroelectronics will be selling their dual-format single chip/laser solution to anyOEM willing to develop a product based on the chip.
HD DVD-R is the writable disc variant of HD DVD, available with a single-layer capacity of 15 GB or a dual-layer capacity of 30 GB.[93] Write speeds depend on drive speed, with a data rate of 36.55 Mbit/s (4.36 MB/s) and a recording time of 56 minutes for 1× media, and 73 Mbit/s (8.71 MB/s) and a recording time of 28 minutes for 2×.
TheToshiba SD-L902A for notebooks was one of the first available HD DVD writers, although it was not meant for retail.[94][95] Burning HD DVD (including Dual Layer) with a 1× write speed, it could also burn DVDs and CDs. In a test of the SD-L902A byC't computer magazine withVerbatim discs, the written HD DVD-Rs suffered from high noise levels,[96] as a result, the written discs could not be recognized by theexternal HD DVD drive of the Xbox 360, though they could be read back by the SD-L902A.[97]
HD DVD-RW is the rewritable disc variant of HD DVD with equal storage capacity to an HD DVD-R. The primary advantage of HD DVD-RW over HD DVD-R is the ability to erase and rewrite to an HD DVD-RW disc, up to about 1,000 times before needing replacement, making them comparable with theCD-RW andDVD-RW standards. This is also of benefit if there are writing errors when recording data, as the disc is not ruined and can still store data by erasing the faulty data. The dual-layer variant was never released and the single-layer variant was, but it is among the rarest of optical media.
HD DVD-RAM was the proposed successor toDVD-RAM for random access on optical media using phase-change principals. It would hold 20 gigabytes per layer instead of 15 gigabytes for HD DVD-R, due to differences in recording methods used, yielding a higher density disc. This variant of HD DVD was never released.
There are two types of hybrid formats which contain standard DVD-Video format video for playback in regular DVD players, and HD DVD video for playback in high definition on HD DVD players. The Combo disc is a dual sided disc with one side DVD and the other HD DVD, each of which can have up to two layers. The Twin disc is a single sided disc that can have up to three layers, with up to two layers dedicated to either DVD or HD DVD.[98] These hybrid discs make retail marketing and shelf space management easier. Another advantage is hardware cross-compatibility. The average consumer does not have to worry about whether or not they can play a hybrid DVD: any standard home DVD player can access the DVD-encoded content and any HD DVD player can access both the DVD- and HD DVD-encoded content.
Warner Bros. officially announcedTotal Hi Def (THD orTotal HD) atCES 2007. THD hybrid discs were to support both HD DVD and Blu-ray Disc, with HD DVD on one side (up to two layers) and Blu-ray Disc on the other side (up to two layers). In November 2007, Warner Bros. cancelled THD's development.[99]
The HD DVD format also applies to current red laser DVDs; this type of disc is called "3× DVD", as it is capable of three times the bandwidth of regularDVD-Video.
3× DVDs are physically identical to normal DVDs. Although 3× DVDs provide the same high definition content, their playback time is less. For example, an 8.5 GB DVD DL can hold about 90 minutes of 1080p video encoded with VC-1 or AVC at an average bitrate of 12 Mbit/s, which corresponds with the average length of Hollywood feature-films. If quality is compromised slightly, and good compression techniques are used, most feature films could be encoded with 3× DVD. Due to its much greater resolution, HD-Video also has significantly more redundant information than DVD which newer compression standards can encode more efficiently.
It is technically possible for consumers to create HD DVD compatible discs using low cost DVD-R or DVD+R media. At least one such guide exists.[100] The 3× DVD is comparable to Blu-ray DiscBD5 and BD9 formats.
HD Rec is an extension of the HD DVD format for recording HD content on regular red laser DVD-Rs/DVD-RWs usingH.264/MPEG-4 AVC (MP4/MP4_AVC) compression.[101] It was approved by theDVD Forum on September 12, 2007[102] It is comparable to Blu-ray Disc'sAVCREC.
TheChina Blue High-definition Disc (CBHD), a high-definition optical disc format, was based upon the HD DVD format. Like the HD DVD, CBHD discs have a capacity of 15 GB single-layer and 30 GB dual-layer and can use existing DVD production lines.
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