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An estimated 1.97 million HD DVD discs have been sold between spring of 2006 and September 2007, compared to 3.01 million Blu-ray discs.<ref>{{cite web | url=http://www.news.com/Blu-ray-outsells-HD-DVD-in-U.S.-for-first-nine-months/2100-1041_3-6214944.html | title=Blu-ray outsells HD DVD in US for First nine months of 2007 - Reuters - Cnet news}}</ref> Sales of these two high-def disc formats accounted for only 2.5% of overall disc sales during the first half of 2007.<ref>{{cite web |url=http://www.highdefdigest.com/news/show/Industry_Trends/Disc_Sales/Disc_Sales:_Hard_Numbers_in_for_First_Half_of_2007/862 |title=Disc Sales: Hard Numbers in for First Half of 2007 |accessdate=2007-10-25 |author= |date=2007-08-15 |work=highdefdigest.com}}</ref>
An estimated 1.97 million HD DVD discs have been sold between spring of 2006 and September 2007, compared to 3.01 million Blu-ray discs.<ref>{{cite web | url=http://www.news.com/Blu-ray-outsells-HD-DVD-in-U.S.-for-first-nine-months/2100-1041_3-6214944.html | title=Blu-ray outsells HD DVD in US for First nine months of 2007 - Reuters - Cnet news}}</ref> Sales of these two high-def disc formats accounted for only 2.5% of overall disc sales during the first half of 2007.<ref>{{cite web |url=http://www.highdefdigest.com/news/show/Industry_Trends/Disc_Sales/Disc_Sales:_Hard_Numbers_in_for_First_Half_of_2007/862 |title=Disc Sales: Hard Numbers in for First Half of 2007 |accessdate=2007-10-25 |author= |date=2007-08-15 |work=highdefdigest.com}}</ref>

===Comparison in computing vs. video use===

There is no difference in quality of video produced by both disks for use in players as they use the same codec standards. Blu-ray does have a higher audio/video data transfer rate and higher maximum video bit rate but these are not necessary for playing high definition content.<ref>{{cite web | url=http://www.blu-ray.com/faq | title=Blu-ray faq - para 3.3}}</ref>

However, there is a difference in performance when used in computers. Blu-ray design supports not only higher total capacity (200gb six layer 6x speed TDK disk tested)<ref>{{cite web | url=http://www.videoforums.co.uk/reviews/news/p2_articleid/260 | title=TDK launches Blu-ray disks - Marc Peters 17 Jul 2007}}</ref> but also higher data transfer rates. Currently 4x 144 Mbps recordable Blu-ray disks are available while only 1x 36 Mbps recordable HD-DVD disks are available (Internet searches as of 18 Jan 2008).


==Continuing development==
==Continuing development==

Revision as of 15:53, 18 January 2008

HD DVD
HD DVD logo
Media typeHigh-density optical disc
EncodingVC-1, H.264, and MPEG-2
Capacity15 GB (single layer)
30 GB (dual layer)
51 GB (triple layer) [1]
Read mechanism1x@36 Mbit/s & 2x@72 Mbit/s
Developed byDVD Forum
UsageData storage, including high-definition video

HD DVD or High-Definition DVD is a high-density optical disc format designed for the storage of data and high-definition video.

HD DVD was designed to be the successor to the standard DVD format and is derived from the same underlying technologies. Since all variants except the 3x DVD employ a blue laser with a shorter wavelength, it can store about 3 1/2 times as much data per layer as its predecessor (maximum capacity: 17 GB per layer instead of 4.7 GB per layer). A 51 GB triple-layer spec has been approved, however no movies are currently scheduled for this disc type.[2]

HD DVD is currently in a "format war" with rival format Blu-ray Disc, to determine which of the two formats will become the leading carrier for high-definition content to consumers.

As of November 27 2007, 344 HD DVD titles have been released in the USA.[3] As of September 15 2007, 133 HD DVD titles have been released in Japan, with 21 titles pending to be released.[4]

History

Optical discs
General
Optical media types
Standards
See also

In the mid 1990s, commercial HDTV sets started to enter a larger market. However, there was no cheap way to record or play back HD content. There was no cheap storage medium that could store that amount of data, except JVC's Digital VHS and Sony's HD Betacam.[5] However, it was well known that using lasers with shorter wavelengths would yield optical storage with higher density. When Shuji Nakamura invented practical blue laser diodes, it was a sensation, although a lengthy patent lawsuit delayed commercial introduction.[6]

Origins and competition from Blu-ray Disc

Sony started two projects applying the new diodes: UDO (Ultra Density Optical) and DVR Blue (together with Pioneer), a format of rewritable discs which would eventually become Blu-ray (more specifically, BD-RE).[7] The core technologies of the formats are essentially similar. The first DVR Blue prototypes were unveiled at the CEATEC exhibition in October 2000 [8]. In February 2002, the project was officially announced as Blu-ray,[9] and the Blu-ray Disc Association was founded by the nine initial members.

The DVD Forum (which was chaired by Toshiba) was deeply split over whether to go with the more expensive blue lasers or not. In addition, the proposed Blu-ray disc with its protective caddy was both expensive and physically different from DVD, posing several problems.[10] 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-layer DVD-9 discs.[11][12] However, 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.[13] In August, Toshiba and NEC announced their competing standard Advanced Optical Disc.[14] It was finally adopted by the DVD forum and renamed to HD DVD the next year,[15] after being voted down twice by Blu-ray Disc Association members, prompting the U.S. Department of Justice to make preliminary investigations into the situation[16][17]. Three new members had to be invited and the voting rules changed before the vote finally passed.[18][19]

Attempts to avoid a format war

In an attempt to avoid a costly format war, the Blu-ray Disc Association and DVD Forum started to negotiate a compromise in early 2005. One of the issues was that Blu-ray's supporters wanted to use a Java-based platform for interactivity (BD-J), while the DVD Forum was promoting Microsoft's "iHD" (which became HDi).[20]. A much larger issue, though, was the physical formats of the discs themselves; the Blu-ray Disc Association's member companies did not want to risk losing billions of dollars in royalties as they had done with standard DVD[21]. An agreement seemed close, but negotiations proceeded slowly.[22]

At the end of June 2005, Sun announced that the Blu-ray Association had chosen the Java-based BD-J interactivity layer instead of Microsoft's HDi. This was based on a BDA board vote favouring BD-J 10 to 4, despite a technical committee previously favouring HDi by a vote of 7 to 5[23]. At the same time, Microsoft and Toshiba jointly announced that they would cooperate in developing high-definition DVD players.[24] In a top-level meeting in July, Microsoft's Bill Gates argued that the Blu-ray standard had to change to "work more smoothly with personal computers". The Blu-ray Disc's representatives defended the technology.[25]

On August 22 2005, the Blu-ray Disc Association and DVD Forum announced that the negotiations to unify their standards had failed.[26] Rumours surfaced that talks had stalled; publicly, the same reasons of physical format incompatibility were cited[21][25] In the end of September, Microsoft and Intel jointly announced their support for HD DVD.[27]

Hewlett Packard (HP) made a last ditch attempt to broker a peace between the Blu-ray Disc Association and Microsoft. HP demanded that the Blu-ray association adopted Microsoft's HDi instead of its own Java solution, and that Blu-ray adopt a mandatory managed copy feature. If their demands weren't met, HP threatened to support HD DVD instead.[28] In a research report, Gartner analysts Van Baker, Laura Behrens and Mike McGuire wrote that if HP's proposal was accepted, Blu-ray would become the winner of the format war.[29] However, the Blu-ray Disc group did not accept HP's offer.[30]

Launch of HD DVD

On March 31 2006, Toshiba released their first HD DVD player in Japan at ¥110,000 (US$934).[31]. That was the first HD player available to consumers, beating Blu-ray to the market by about three months.[32] HD DVD was released in United States on April 18 2006,[33] with players priced at $499 and $799.

The first HD DVD titles were released on April 18 2006. They were The Last Samurai, Million Dollar Baby, and The Phantom of the Opera by Warner Home Video and Serenity by Universal Studios.[34] The first independent HD film released on HD DVD was One Six Right.[35][36]

Sales Developments

In December 2006, Toshiba reported that roughly 120,000 Toshiba branded HD DVD players have been sold in the United States along with 150,000 units coming in the form of HD DVD upgrade kits for the Xbox 360.[37]

As of April 18 2007, (on the first “birthday” of HD DVD),[38] the HD DVD camp reported that they had sold 100,000 dedicated HD DVD units in the U.S. alone, (not including any computers with HD DVD drives or Xbox 360 add-ons drives—the latter of which was reported to have sold 92,000 units during the Christmas holiday season).[39]

The first HD DVD Recorders were released mid 2007 in Japan.[40]

In November 2007, the Toshiba HD-A2 was the first high definition player, either HD DVD or Blu-ray, 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 November 2007, The HD DVD promotion group announced that 750,000 HD DVD players have been sold. The 750,000 number includes stand-alone players and the Xbox 360 add-on.[41]

Technical specifications

The current specifications for HD DVD-ROM and HD DVD-RW are version 1.0. The specification for HD DVD-R is currently at 0.9; the HD DVD-RAM specification is not yet finalized.

Disc structure

HD DVD-ROM has a single-layer capacity of 15 GB, a dual-layer capacity of 30 GB, and a 51 GB triple-layer disc (which uses slightly bigger 17 GB layers), approved in November 2007 by the DVD Forum[2]. Toshiba has declined to say whether the 51GB, triple-layer disc is compatible with existing drives and players. Specification 2.0 Part 1 (Physical Specification) for triple layer HD DVD has been approved in November 2007.[42]

HD DVD-R and HD DVD-RW have a single-layer capacity of 15 GB, a dual-layer capacity of 30 GB. HD DVD-RAM has a single-layer capacity of 20 GB.[43] Like the original DVD format, the data layer of an HD DVD disc is 0.6 mm below the surface to physically protect the data layer from damage. The numerical 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.[44]

Physical size Single layer capacity Dual layer capacity Triple layer capacity
12 cm, single sided 15 GB 30 GB 51 GB (17 GB per layer instead of 15 GB)
12 cm, double sided 30 GB 60 GB
 8 cm, single sided 4.7 GB 9.4 GB
 8 cm, double sided 9.4 GB 18.8 GB

File systems

As with previous optical disc formats, HD DVD supports several file systems, such as ISO 9660 and Universal Disk Format (UDF). Currently, all HD DVD titles use UDF version 2.5 as the file system.

Audio

HD DVD discs support encoding in up to 24-bit/192 kHz for two channels, or up to eight channels of up to 24-bit/96 kHz encoding.[45] For reference, even new big-budget Hollywood films are mastered in only 24-bit/48 kHz, with 16-bit/48 kHz being common for ordinary films.[citation needed]

All HD DVD players are required to decode linear (uncompressed) PCM, Dolby Digital AC-3, Dolby Digital EX, DTS, Dolby Digital Plus and Dolby TrueHD.[46] 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 and DTS-HD Master Audio.

For the highest-fidelity audio experience, HD DVD offers content-producers the choice of linear PCM, Dolby TrueHD and DTS-HD Master Audio. Due to the high-bandwidth requirements of linear-PCM, lossless audio on HD DVD movies has thus far been delivered in the lossless format Dolby TrueHD.

Video

The HD DVD format supports a wide variety of resolutions, from low-resolution CIF and SDTV, all video resolutions supported by the DVD-Video standard, and up to HDTV formats such as 720p, 1080i and 1080p.[45] HD DVD supports video encoded in MPEG2 which is what is used in DVDs as well as the new formats VC-1 and AVC which are more efficient. All movie titles released so far have had the feature encoded in 1080p, with most supplements in 480i or 480p. Almost all titles are encoded with VC-1, and most of the remaining titles encoded with AVC.

Digital rights management

Main article: Advanced Access Content System

If a publisher wishes to restrict use of their HD DVD content, they may use the Advanced Access Content System (AACS) although this is not required for normal disc playback. AACS is a standard for content distribution and digital rights management. It is developed by AACS Licensing Administrator, LLC (AACS LA), a consortium that includes Disney, Intel, Microsoft, Matsushita (Panasonic), Warner Bros., IBM, Toshiba and Sony. One of the advantages over CSS, the content restriction system for DVDs, is that AACS allows content providers to revoke an individual player device if its cryptographic keys have been compromised (meaning that it will not be able to decrypt subsequently released content). There is no Region Coding in the existing HD DVD specification, which means that titles from any country can be played in players in any other country. This is likely to give the format some advantage in Europe and other places where consumers are now used to using multi-region players to play DVDs purchased in the US or through the extensive grey market.

Since appearing in devices in 2006, several successful attacks have been made on the format. The first known attack relied on the trusted client problem. In addition, decryption keys have been extracted from a weakly protected player (WinDVD). Notably, a Processing Key was found that could be used to decrypt all HD content that had been released at the time.[47] The processing key was widely published on the Internet after it was found and the AACS LA sent multiple DMCA takedown notices in the aim of censoring it.[48] This caused trouble on some sites that rely on user-submitted content, like Digg and Wikipedia, when administrators tried to remove any mentions of the key.[49][50]

Further information: AACS encryption key controversy

AACS has also been circumvented by SlySoft with their program AnyDVD 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.[51] Other AACS circumvention programs have become available, like DVDFab HD Decrypter.[52]

Interactive content

HD DVDs use the HDi Interactive Format to allow interactive content to be authored for discs. HDi is based on web technologies such as HTML, XML, CSS, SMIL, and ECMAScript (JavaScript), so authoring in HDi should be a fairly easy transition for web developers. No existing DVD authoring experience is required. In contrast, Blu-ray Disc content is authored using either a scripting environment for basic content, or a Java-based platform (BD-J) for advanced content. DVD video discs utilize pre-rendered MPEG segments, selectable subtitle pictures, and simple programmatic navigation which is considerably more limited.

Hardware

Compatibility

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 discs. 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 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.

General purpose computers

HD DVD drives can also be used with a desktop/laptop personal computer (PC) running Windows XP, Windows Vista, Mac OS X v10.5 "Leopard", and many varieties of Linux. Third-party player software for Windows and Linux have successfully played HD DVD titles using the add-on drive. First-party (Apple, Inc.) player software is included with Leopard, making it the first operating system (OS) to ship with native HD DVD playing software, albeit limited to HD DVD disks authored by DVD Studio Pro.[53]

List of HD DVD devices

See List of HD DVD devices

Xbox 360

Xbox 360 and add-on HD DVD drive
For more details on this topic, see Xbox 360 accessories - HD DVD player

Released at the end of November 2006, the Microsoft HD DVD drive for the Xbox 360 game-console gives the Xbox 360 the ability to play HD DVD movies. The drive was announced with an MSRP of US$199 and includes a USB 2.0 cable for connection to the console. The first drives also included Peter Jackson's King Kong on HD DVD.

Corporate and industry support

HD DVD Promotion Group Member List contains the main promoters of HD DVD: Toshiba, NEC, Sanyo, Microsoft, RCA, Kenwood, Intel, Venturer Electronics and Memory-Tech Corporation. The HD DVD format is also non-exclusively supported by Acer, Asus, HP, Hitachi Maxell, LG, Lite-On, Onkyo, Meridian, Samsung,[54] and Alpine.

Studio Alliances

Current and announced release formats v. 2007 US box office share[55]

HD DVD is currently exclusively backed by Universal Studios (including subsidiaries Focus Features and Rogue Pictures), Nickelodeon Movies, MTV Films, DreamWorks Pictures and DreamWorks Animation), and The Weinstein Company (including Dimension Films).

On August 20 2007, Paramount Pictures, DreamWorks Pictures and DreamWorks Animation, announced they would no longer be supporting the Blu-ray Disc format, due to a contract they signed with HD-DVD.

Together, Paramount and DreamWorks are currently the 2007 box office leaders, and their first two HD DVD-exclusive titles, Shrek the Third and Transformers, are both poised to be top sellers during the 2007 holiday season.[56][57] Movies directed by Steven Spielberg are not included in this announcement, as Spielberg controls his films.[58] In an interview with PC World, Alan Bell, the Executive Vice President and Chief Technology Officer for Paramount Pictures, stated the exclusive support for HD DVD is currently indefinite.[59] However, two Viacom executives who spoke to the New York Times disclosed that the terms of the agreement were for $150 million in incentives in exchange for an exclusivity period of at least 18 months, or through the next two holiday seasons.[60] In response to these reports of a $150 million deal, DreamWorks Animation CEO Jeffrey Katzenberg stated that it was disingenuous for other companies to suggest that they were not compensated for endorsing Blu-ray.[61]

Warner Brothers Pictures, initially in the HD DVD camp, later decided to support both formats. However, on January 4, 2008, they announced that they are discontinuing HD DVD support as of June 1, 2008. Furthermore, they intend to delay remaining HD DVD titles until after standard DVD and Blu-ray releases.[62]. Warner Brothers has also scheduled all of their HD DVD exclusive titles for release on Blu-ray in the near future. Warner Brothers' subsidiary New Line Cinema has followed suit, cancelling tentative plans to release titles on HD DVD contingent on region coding with immediate effect, thus making Pan's Labyrinth its first and last HD DVD release[63].[64][65][66] The New York Times has speculated that Warner Brothers' decision will "kill HD DVD".[67] The HD DVD group responded to the decision by stating, "We remain firm in our belief that HD DVD is the format best suited to the wants and needs of the consumer. While there is speculation other HD DVD backers may drop the format and back Blu-ray, so far the only studio to have responded, Paramount, has denied rumors it intends to do so.[68]

Studios that still support both formats include BBC [69] First Look Studios [70], Image Entertainment (including the Discovery Channel),[71] Magnolia Pictures,[72] Brentwood Home Video, Ryko,and Koch/Goldhil Entertainment.[73]

File:Transformers hddvd.jpg
Transformers HD DVD retail packaging

In Europe, HD DVD is currently supported either exclusively or non-exclusively by Medusa Home Entertainment, Studio Canal, Universum Films, Kinowelt Home Entertainment, DVD International, Opus Arte, MK2, Momentum Pictures, Twister Home Video, and many others.[74]

Outside of the United States, movies from American studios are often distributed by different companies (e.g. StudioCanal in Europe). Thus many of these Blu-ray exclusive titles are available outside the U.S. on HD DVD.[75] Likewise, movies that are exclusive to HD DVD in the United States have Blu-ray releases in other regions. An example of this is the Universal Studios film Bruce Almighty, which has been released exclusively on HD DVD in the U.S., but has been released as a Blu-ray exclusive in Europe due to the distribution rights held by Buena Vista.[76] Since some studios may choose to region code their Blu-ray discs, importing those titles can be more difficult than importing HD DVD discs, which are region-free by design.[77]

Other Interests

In the music industry, HD DVD is currently exclusively supported by EMI and non-exclusively supported by Universal Music Group.[78]

Contrary to many internet blogs, it has been reported by ABC News that the porn industry will not be a factor in the current format war.[79] The main reason is that many pornographic websites have movie downloads as an option, thus making the disc format less important.

In July 2007, Blockbuster Video[80] began carrying Blu-ray Disc exclusively in 1,450 stores, in addition to the original 250 that carried both HD DVD and Blu-ray. Online they will still be offering both formats.[81] Blockbuster will continue to offer both formats at its initial 250 stores that currently carry both high-definition formats.[82]

Netflix, the world's largest online movie rental service[83], offers titles in both HD DVD and Blu-ray formats. According to a new Internet tracking report, although Netflix's Blu-ray pages receive more hits, users are more likely to set HD DVD as their preferred format.[84] Netflix does not charge extra for high definition titles compared to standard DVDs. Netflix currently has hundreds of titles available in both high definition formats.[85]

On October 29 2007, Toshiba announced that Kmart would exclusively carry HD DVD standalone players in their stores (due to their lower price). However, Kmart later denied that it was exclusively selling either format.[86][87] A follow-up by CNBC further clarified that in fact Kmart had no plans to offer Blu-ray standalone players because of HD DVD players' lower price. [88] Notwithstanding, Kmart will continue selling the PlayStation 3, which is capable of playing Blu-ray movies.

HD DVD / Blu-ray disc comparison

Main article: Comparison of high definition optical disc formats

The primary rival to HD DVD is Blu-ray Disc. Due to the format war, both sides are currently vying to promote their format as the best choice for studios and consumers. The technical details of each format do not differ much and should not affect the average consumer. Both formats are superior to DVD and produce quality HD video playback.

There is no Region Coding in the existing HD DVD specification; titles from any country can be played in any player. Some Blu-ray discs have Region Coding and will only play in players sold in the corresponding geographic region.

An estimated 1.97 million HD DVD discs have been sold between spring of 2006 and September 2007, compared to 3.01 million Blu-ray discs.[89] Sales of these two high-def disc formats accounted for only 2.5% of overall disc sales during the first half of 2007.[90]

Comparison in computing vs. video use

There is no difference in quality of video produced by both disks for use in players as they use the same codec standards. Blu-ray does have a higher audio/video data transfer rate and higher maximum video bit rate but these are not necessary for playing high definition content.[91]

However, there is a difference in performance when used in computers. Blu-ray design supports not only higher total capacity (200gb six layer 6x speed TDK disk tested)[92] but also higher data transfer rates. Currently 4x 144 Mbps recordable Blu-ray disks are available while only 1x 36 Mbps recordable HD-DVD disks are available (Internet searches as of 18 Jan 2008).

Continuing development

Although the HD DVD standard is final, engineers continue developing the technology. At the CES 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. However, a major obstacle to implementing this technology is that current reader-writer technology may not support the additional data layers.[93]

NEC,[94] Broadcom,[95] Horizon Semiconductors, and STMicroelectronics[95] 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 any OEM willing to develop a product based on the chip.

Variants

DVD / HD DVD hybrid discs

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.[96] These hybrid discs make retail marketing and shelf space management easier. Another advantage is hardware cross-compatibility. The average consumer doesn't have to worry about whether or not they can play a hybrid DVD disc: any standard home DVD player can access the DVD encoded content and any HD DVD player can access both the DVD and the HD DVD encoded content.

HD DVD / Blu-ray hybrid discs

Warner Bros. officially announced Total Hi Def (THD) at CES 2007. Total Hi Def (Total HD) hybrid discs were to support both HD DVD and Blu-ray, with HD DVD on one side (up to two layers) and Blu-ray on the other side (up to two layers). However, in November of 2007, Warner Brothers cancelled development of the Total HD discs [97]

3x DVD

The HD DVD format also applies to current red laser DVDs, this type of disc is called "3x DVD", as it is capable of three times the bandwidth of regular DVD-Video.

3x DVDs are physically identical to normal DVDs. Although 3x DVDs provide the same high definition content, their playback time is less. For example, an 8.5 GB DVD can hold about 85 minutes of 1080p video encoded with VC-1 or AVC at an average bitrate of 13 Mbit/s, suitable for short subjects (training films, home movies), but unsuitable for feature film-length content.

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.[98] The 3x DVD is comparable to Blu-ray's BD9.

HD REC

HD Rec is an extension of the HD DVD format for storing HD content on regular red laser DVDs using H.264/MPEG-4 AVC compression.[99] It was approved by the DVD Forum on September 12 2007[100] It is comparable to Blu-ray's AVCREC.

See also

Alternative disc technologies

References

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