HD DVD.docx
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HD DVD.docx
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HDDVD
HDDVD
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HDDVD
Mediatype:
High-densityopticaldisc
Encoding:
VC-1,H.264,andMPEG-2
Capacity:
15GB(singlelayer)and30 GB(duallayer)
Readmechanism:
1x@36 Mbit/s&2x@72 Mbit/s
Developedby:
DVDForum
Usage:
Datastorage,includinghigh-definitionvideo
HDDVD,orHigh-DefinitionDVDisahigh-densityopticaldiscformatdesignedforthestorageofdataandhigh-definitionvideo.
Contents
[hide]
∙1History
∙2Technicalspecifications
o2.1Discstructure
▪2.1.1Hybridformats
▪2.1.23xDVD
▪2.1.3Ongoingdevelopment
o2.2Filesystems
o2.3Audio
o2.4Video
∙3Digitalrightsmanagement
∙4Interactivecontent
∙5Hardware
o5.1Compatibility
o5.2HDDVDstandaloneplayers
o5.3Universal(HDDVD+Blu-rayDisc)standalonecomboplayers
o5.4Computerdrives
o5.5Xbox360
∙6Releasedtitles
∙7Corporateandindustrysupport
o7.1Hybridplayertechnology
o7.2Hybridmedia/discs
∙8HDDVD/Blu-raydisccomparison
∙9Seealso
o9.1Alternativedisctechnologies
∙10References
∙11Externallinks
o11.1News
[edit]History
Opticaldiscauthoring
∙Opticaldisc
∙Opticaldiscimage
∙Recorderhardware
∙Authoringsoftware
∙Recordingtechnologies
oRecordingmodes
oPacketwriting
Opticalmediatypes
∙Laserdisc
∙CompactDisc/CD-ROM:
CD-R,CD-RW
∙MiniDisc
∙DVD:
DVD-R,DVD-RDL,DVD+R,
DVD+RDL,DVD-RW,DVD+RW,
DVD-RWDL,DVD+RWDL,DVD-RAM
∙Blu-rayDisc:
BD-R,BD-RE
∙HDDVD:
HDDVD-R:
HDDVD-RAM
∙UDO
∙UMD
∙Holographicdatastorage
∙3Dopticaldatastorage
∙Historyofopticalstoragemedia
Standards
∙RainbowBooks
∙Filesystems
oISO9660
▪Joliet
▪RockRidge
▪AmigaRockRidgeextensions
▪ElTorito
▪AppleISO9660Extensions
oUniversalDiskFormat
▪MountRainier
TheHDDVDdiscisdesignedtobethesuccessortothestandardDVDformat,andisderivedfromthesame.Itcanstoreaboutthreetimesasmuchdataasitspredecessor(15 GBperlayerinsteadof4.7 GB).TheHDDVDstandardwasjointlydevelopedbyToshibaandNEC.[1]On19November2003,theDVDForumvotedtosupportHDDVDasthehighdefinitionsuccessorofthestandardDVD.Atthismeeting,theyalsorenameditHDDVD.HDDVDstandsfor"HighDefinitionDigitalVersatileDisc".[2]Theformathadpreviouslybeencalledthe"AdvancedOpticalDisc"(AOD).
AtCES2006,companiesbackingHDDVDsaidthatnearly200titleswouldbeavailablefortheformatbytheendoftheyear.[3]
ThecurrentspecificationversionforHDDVD-ROMandHDDVD-Rewritableisversion1.0.ThespecificationforHDDVD-Riscurrentlyat0.9,theHDDVD-RAMisnotyetfullyfinalized.ThefirstHDDVD-ROMdriveswerereleasedinlate2006.However,noHDDVDrecordersarecurrentlyforsale.
HDDVDiscurrentlyinaformatwarwithrivalformatBlu-rayDisc.
[edit]Technicalspecifications
[edit]Discstructure
HDDVDhasasingle-layercapacityof15GBandadual-layercapacityof30 GB,theHDDVD-RAMhasasingle-layercapacityof20GBandadual-layercapacityofUndecided.[4]LiketheoriginalDVDformat,thedatalayerofanHDDVDdiscis0.6 mmbelowthesurfacephysicallyprotectingthedatalayerfromdamage.Thenumericalapertureoftheopticalpick-upheadis0.65,comparedwith0.6forDVD.AllHDDVDplayersarebackwardcompatiblewithDVDandCD.
Physicalsize
Singlelayercapacity
Duallayercapacity
12 cm,singlesided
15 GB
30 GB
12 cm,doublesided
30 GB
60 GB
8 cm,singlesided
4.7 GB
9.4 GB
8 cm,doublesided
9.4 GB
18.8 GB
[edit]Hybridformats
TherearetwotypesofhybridformatswhichcontainsstandardDVD-VideoformatvideoforplaybackinregularDVDplayers,andHDDVDvideoforplaybackinhighdefinitiononHDDVDplayers.TheCombodiscwhichisadualsideddiscwithonesideDVDandtheotherHDDVD,eachofwhichhaveuptotwolayers.TheTwindiscwhichisasinglesideddisccontaininguptothreelayers,withuptotwolayersdedicatedtoeitherDVDorHDDVD.[5]Thesehybriddiscsmakeretailmarketingandshelfspacemanagementeasier.ThisalsoremovessomeconfusionfromDVDbuyerssincetheycannowbuyadisccompatiblewithanyDVD/HDDVDplayerintheirhouse.
[edit]3xDVD
TheHDDVDformatcanalsobeappliedtocurrentredlaserDVDswhichoffersalower-costoptionfordistributors;thistypeofdisciscalled"3xDVD"asitiscapableofuptothreetimesthebandwidthofregularDVD-Video.
3xDVDsarephysicallyidenticaltonormalDVDs,whichexplainswhythecostislowerforthephysicalmedia.While3xDVDsprovidethesamehighdefinitioncontent,thetradeoffisthatplaybacktimeislimited.Forinstance,onan8.5 GBDVDyoucouldfitabout85minutesof1080pvideoencodedwithVC-1orAVCatanaveragebitrateof13 Mbit/s.Thismakestheformatsuitableforsubjectssuchastrainingvideosandhomemovies,butnotsuitablefortypicalwidereleasestudiomovies.
ItistechnicallypossibleforconsumerstocreateHDDVDcompatiblediscsusinglowcostDVD-RorDVD+Rmedia.Atleastoneguidehasbeenwrittenthatwalksusersthroughauthoringthesediscs.[6]
[edit]Ongoingdevelopment
AlthoughtheHDDVDstandardhasbeenfinalized,engineerscontinueworkingtoadvancethetechnology.AttheConsumerElectronicsShowonJanuary7,2007,ToshibaannouncedthattheyhavecreatedHDDVDswith17 GBlayers,anddemonstratedatriple-layer51 GBdisc.[7]ToshibaaimstosecureapprovalofthenewdiscbytheDVDForumwithinthisyear.[8]Thereisnoguaranteethatthetriple-layerformatwillworkinexistingplayersasitwasnotpartoftheoriginalmandatoryspecifications.
AlsobehindcloseddoorsatCES2007,RitekhasrevealedthattheyhadsuccessfullydevelopedaHighDefinitionopticaldiscprocessthatextendsthedisccapacityofbothcompetingformatsto10layers.Thatincreasesthecapacityofthediscsto150 GBforHDDVDand250 GBforBlu-rayDisc.However,theynotedthatthemajorobstacleisthatcurrentreaderandwritertechnologydoesnotsupporttheadditionallayers.[9]
[edit]Filesystems
Likepreviousopticaldiscformats,HDDVDsupportsseveralfilesystems,likeISO9660andUniversalDiskFormat(UDF).Currently,allHDDVDtitlesuseUDFversion2.5asthefilesystem.
[edit]Audio
HDDVDdiscssupportencodinginupto24-bit/192 kHzfortwochannels,oruptoeightchannelsofupto24-bit/96 kHzencoding.[10]Forreference,evennewbig-budgetHollywoodfilmsaremasteredinonly24-bit/48 kHz,with16-bit/48 kHzbeingcommonforordinaryfilms.[citationneeded]
AllHDDVDplayersarerequiredtodecodelinear(uncompressed)PCM,DolbyDigitalAC-3,DolbyDigitalEX,DTS,DolbyDigitalPlusandDolbyTrueHD.[11]Asecondarysoundtrack,ifpresent,canbestoredinanyoftheaforementionedformats,orinoneoftheHDDVDoptionalcodecs:
DTS-HDHighResolutionAudioandDTS-HDMasterAudio.
Forthehighest-fidelityaudioexperience,HDDVDofferscontent-producersthechoiceoflinearPCM,DolbyTrueHDandDTS-HDMasterAudio.Duetothehigh-bandwidthrequirementsoflinear-PCM,losslessaudioonHDDVDmovieshasthusfarbeendeliveredinthelosslessformatDolbyTrue-HD.
[edit]Video
TheHDDVDformatsupportsawidevarietyofresolutions,fromlow-resolutionCIFandSDTV,allvideoresolutionssupportedbytheDVD-Videostandard,anduptoHDTVformatssuchas720p,1080iand1080p.[10]HDDVDsupportsvideoencodedinMPEG2whichiswhatisusedinDVDsaswellasthenewformatsVC-1andAVCwhicharemoreefficient.Allmovietitlesreleasedsofarhavehadthefeatureencodedin1080p,withmostsupplementsin480ior480p.AlmostalltitlesareencodedwithVC-1,andmostoftheremainingtitlesencodedwithAVC.
[edit]Digitalrightsmanagement
Mainarticle:
AdvancedAccessContentSystem
HDDVDcontentisprotectedbytheAdvancedAccessContentSystem(AACS)astandardforcontentdistributionanddigitalrightsmanagement.ItisdevelopedbyAACSLicensingAdministrator,LLC(AACSLA),aconsortiumthatincludesDisney,Intel,Microsoft,Matsushita(Panasonic),WarnerBrothers,IBM,ToshibaandSony.OneoftheadvantagesoverCSS,thecontentprotectionsystemforDVDs,isthatAACSallowscontentproviderstorevokeanindividualplayerdeviceifitscryptographickeyshavebeencompromised(meaningthatitwillnotbeabletodecryptsubsequentlyreleasedcontent).ThereisnoRegionCodingintheexistingHDDVDspecification.
Sinceappearingindevicesin2006,severalsuccessfulattackshavebeenmadeontheformat.Thefirstknownattackreliedonthetrustedclientproblem.Inaddition,decryptionkeyshavebeenextractedfromaweaklyprotectedplayer(WinDVD).Notably,aProcessingKeywasfoundthatcouldbeusedtodecryptallHDcontentthathadbeenreleasedatthetime.[12]TheprocessingkeywaswidelypublishedontheInternetafteritwasfoundandtheAACSLAsentmultipleDMCAtakedownnoticesintheaimofcensoringit.[13]Thiscausedtroubleonsomesitesthatrelyonuser-submittedcontent,likeDiggandWikipedia,whenadministratorstriedtoremoveanymentionsofthekey.[14][15]
Formoredetailsonthistopic,seeAACSencryptionkeycontroversy.
AACShasalsobeencircumventedbySlySoftwiththeirprogramAnyDVDHD,whichallowsuserstowatchHDDVDmoviesonnon-HDCP-compliantPChardware.SlysofthasstatedthatAnyDVDHDusesseveraldifferentmechanismstodisabletheencryption,andisnotdependentontheuseofcompromisedencryptionkeys.[16]
[edit]Interactivecontent
HDDVDsusetheHDiInteractiveFormattoallowinteractivecontenttobeauthoredfordiscs.HDiisbasedonwebtechnologiessuchasHTML,XML,C
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