HD-DVD

the hp DVD (High definition digitally Versatile disk and/or. High Density digitally Versatile disk, before: Advanced Optical disk, AOD) is a possible follow-up format of the DVD.

The AOD was specified by the Advanced Optical disk consortium (AOD), that and. A. NEC, Microsoft, Belong to Toshiba , Intel , IBM and Time Warner. The complete list counts in approximately hundred names (see Web on the left of). These companies united meanwhile to the HD-DVD graduation Group, in order to make the HD-DVD better well-known as competition product Blu ray the disk.

The competitive Blu ray campassembles against it from enterprises such as Sony, Matsushita (Panasonic), Pioneer, LG, Dell, Apple, Philips, BenQ and Samsung.

The DVD forum has the hp DVD as prospective HDTV - successors of the DVD to 19. November 2003 provisionally after „the hpDVD specifications for READ Only disks” discharges.

For the hp DVD like also for Blu ray the disk the copy protection Advanced ACCESS content system ( AACS) from the range digitally of the Rights management is intended.

To 31. March 2006 is with the HD-XA1 von Toshiba the first Hp-DVD-Playercome into Japan into the trade.

To table of contents

physical structure

HD-DVD Player HBS-A-001 von Toshiba. Togetherpresented with dual a Layer HD-DVD with 30GB capacity and a twin HD-DVD with a Layer as DVD with 5 GB and a Layer HD-DVD with 15 GB capacity.

The hp DVD is based, like Blu ray the disk, on a blue-violet laser with 405 Nm Wavelength. The thickness of the carrier layer is to 0.6 mm to that the DVD, the numeric aperture ( WELL) amounts to identical against it instead of 0,6 with DVD only 0.65 (0.85 with Blu ray).

The hp DVD a storage capacity per situation becomes prospective and/or. Layer possess, of:

  • 15 GB(with hp DVD of Rome - pressed media) and/or.
  • 15 GB (with hp DVD R/RWs - once and again-recordable media) and/or.
  • 20 GB (with hp DVD RAM - again-recordable media with optional sector access)

how many laminating into the final standard it is implemented is not yet well-known. Past prototypeswrite on einlagige media 20 GB data, on two-part media approximately 30 GB. The newest hp DVD standard is to make a storage capacity possible of up to 64 GB (reciprocally, with in each case two layers).

logical structure

one must differentiate with the logical structure, between thatFile format and the data format of videos stored in the file system as well as additional elements the copy protection concerning AACS:

like also the CD or the DVD will divide themselves file format the formats for the HD-DVD into several categories:

  • Data: There is data TRACKs as after ISO 9660/Joliet and UDF possible
  • video: There is special file formats, memory places and file names for video data intended, similarly as with the video DVD the case is (see to far below the disk types for hp DVD video)
  • copy protection: Certain data areas of the HD-DVD are for thosethe copy protection data concerned reserves.

data format for DVD video

supported video codecs:

supported audio codecs:

with thatHD-DVD video are differentiated three disk types:

  • Disk type 1 (standard content)

this type is an extension of the DVD Videoformates. The well-known structures are mostly maintained. The differences to DVD video are limited essentially to make the administration possible of the new video/audio codecs.

  • Disk type 2 (Advanced content)

Disk type 2 was defined, in order to win more flexibility in the comparison to the DVD video Navigationsstruktur. One of the most important innovations in the Advanced content is that now no more all data on the DVD must be appropriate, but parts (over the indication URL) from the Internet, for the network,a non removable disk o. A. to be loaded can. Also the navigation structure was arranged very many more flexible in the comparison to DVD video. Navigation is not regulated now no more over Program chain and navigation COMMAND. Instead are on the HD-DVD JScript applications, which over a special API (ihd DVD)steer the Player, react on key vents, menus draw, sub-titles fade in, etc.

  • Disk type 3 (standard & Advanced content)

disk type 3 is a combination of type 1 and type 2.

copy protection

the HD-DVD video (in all forms, also the recordable and again-recordable- R and - R/W formats) uses as copy protection AACS. Here there is however (in the AACS embodied) a stricter separation from unprotected data and copy protection-relevant or copy-protected data: During with the DVD only that access to the CSS - keys for the video by Authentifizierung and regional code protectedis, this protection expands with the HD-DVD since all protected contents. All protected contents of a HD-DVD video only authentifizierte components may access. Under “authentifizierten component” is thereby either about the AACS LA of certified condition alone Player to be understood or however it is on a PC (likewise in its individual parts) interaction of operating system, device driver and rendition program certified.

comparison

comparison of the characteristics of the HD-DVD with those Blu ray the disk:

  • Blu ray the disk has in the two-part version a storage capacity of 50 GByte. In the laboratoryalready vierlagige and achtlagige prototypes were manufactured.
  • The HD-DVD is considered to manufacture as simpler, since she is developed similarly as a DVD; the manufacturers of DVD media can thus possibly continue using parts of their production plants.
  • First versions Blu ray of the disk needed a special sleeve (cartridge). Upthis sleeve can be done without since the last prototypes due to a particularly hard surface, which accepts only badly finger marks and is extremely scratch-proof. The development of these „naked” disk was important, in order to lower the manufacturing costs of the BD and to increase their attractiveness for the Filmstudios.

copy protection

for video data, which can be shown by a condition alone Player, stored on a HD-DVD, is used automatically the DRM - system AACS. This applies also to the recordable and again-recordable disk types DVD-R video and DVD-R/W video. These disks contain besides individual keys,by the DRM to be considered and to the coding of contents be transferred must, around an useful (D. h. to generate again playable) recording.

Within AACS different possibilities are fixed, as for the decoding of “protected” (thus coded) contents keys force be generated can:

  • Gives key blocks on the HD-DVD, by the drive assembly after the Authentifizierung to be read can and from those with keys of the Players for the decoding necessary keys compute themselves
  • the key is not even on the HD-DVD to contain, but it becomes over URLloaded from the Internet. For this an Internet connection is necessary when playing, in addition the inquiring program must be able itself to authentifizieren in relation to the key assignment in the Internet.

The Hp-DVD-standard prescribes in addition also that for the expenditure of the video a protection must be present, even if the rangethe compressed video data one leaves. For the moment for it only HDCP might be applicable. There with HDCP in connection with suitable control signals (those the HD-DVD contained in the data stream beside the compressed audio and video data contrary to the DVD explicitly can) also a restriction of the similarImage output of “HDTV dissolution similarly” over “SDTV dissolution similarly” to down on “no similar image output” possible is, does up to now all manufacturers with the presentation of its Hp-DVD-Player without appropriate similar picture exits, which put devices as expenditure possibility only to HDMI at the disposal; one point is with the fact also that itfor highly soluble video signals differently than for low dissolved no similar copy protection (in the kind of macro vision) gives. Since there are in particular few television sets in the key markets the USA and Japan proportionately only, those with HDCP coded picture signals to get along knows this restriction for the present version of theStandards to a problem become; however it would be also possible for disks within the AACS, to mastern, who permit no digital copy, but similar image output in HDTV quality permit.

Here in Europe the manufacturers of television sets with the label “hp ready” try, the customer doubt regardingto take the “copy protection at the screen”.

ready for the market one

on the Consumer Electronics show (CES) at the beginning of of 2004 in read Vegas presented to Toshiba the prototype of a Hp-DVD-recorder with a storage capacity of 30 GB. That followed in May 2005 after Media carousing Expo in readVegas the conception of a three-fold HP-DVD-ROM with 45 GByte storage capacity.

NEC wanted to bring starting from December 2005 the first Hp-DVD-ROM-drive assembly for PCs on the market under the designation to HR-1100A. The HR 1100A should be completely downward compatible thereby and thus all CD and DVD variants inclusive DVD-RAMto read can. Recorders for the PC are to then follow 2006. This could not be realized however due to delays with the Verabschiedung of the copy protection standard AACS, from which there was a provisional version until January 2006 only.

On the CES beginning 2006 first becamePlayer presented, however only very few devices at all demonstrated, this besides only with provisional media, which might not correspond probably to the late in the trade available.

First condition alone devices (Player) were announced by different manufacturers for March 2006. The devices become for the image output over HDMI- Exits order, in addition they will apparent have all a Ethernet connection for Internet entrance.

The requirements of the arithmetic performance and the copy protection leave the conditions for the expenditure of HD-DVD video over the PC to appear just as problematic as before eight years the expenditure of DVD videothe PC: Thus the arithmetic performance of at present available hardware is enough only scarcely for an expenditure in real time, equally the copy protection represents a problem for the picture exit.

alternatives

the companies Sony and Plasmon have besides professional optical Speicherfomate on thatMarket brought, which are based on Blu ray the disk and likewise work therefore with a blue-violet laser:
  • terabyte DVD in range (Heise article of17. May 2003) - a newer development with other technology provides for up to a Terabyte storage capacity per disk, whereby it probably likewise concerns a holografische storage technology.

see to Versatile

Web on the left of

  • official sides:


 

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