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DVD (commonly "Digital Versatile Disc" or "Digital Video Disc") is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. DVDs resemble compact discs as their diameter is the same (120 mm (4.72 inches) or occasionally 80 mm (3.15 inches) in diameter), but they are encoded in a different format and at a much higher density. All read-only DVD discs, regardless of type, are DVD-ROM discs. This includes replicated (factory pressed), recorded (burned), video, audio, and data DVDs. A DVD with properly formatted and structured video content is a DVD-Video. DVDs with properly formatted and structured audio are DVD-Audio discs. Everything else (including other types of DVD discs with video) is referred to as a DVD-Data disc. However, many people use the term "DVD-ROM" to refer to pressed data disks only. DVD Infomatrix (a wealth of information about DVD PCs) MPEGX (PC utilities for video and audio, more) Dvdsoft (PC utilities, more) Doom9 (PC utilities for DVD backup) Visualdomain (PC utilities, including, Drive Info ) DVDCity (code-free DVD player FAQ) Code Free DVD (region-free DVD players) Code Free DVD Mart (region-free DVD players and information) Region Free DVD (region workarounds for players and PCs) RegionFreeDVDPlayers (region-free DVD players) ZoneFreeDVD (region-free DVD players) Dvdkits (modification chips for DVD players) DVD Upgrades (region-free DVD players and modification chips) DVDoverseas (region-free DVD players) Link Electronics (region-free DVD players and upgrades) Techtronics (region-free DVD players and upgrades) Upgrade Heaven (region-free DVD players) Eric"s DVD Information (tech info on early players) Google Deja Usenet Archive (search the rec.video.dvd and alt.video.dvd newsgroups) The Mac DVD Resource (region-free info for Macs) RipDifferent Forum (discussion of audio and video ripping on Macs) PowerBook DVD Source (info about DVD on Macs) DVD Made Easy (tutorials, forums, and other resources; fee-based) EZ DVD Advisor ; (forums and other resources) DVD Developer Club at Yahoo (discussion of authoring techniques and problems) TFDVD (subscription side, mostly focused on Apple DVD Studio Pro) UK media.dvd FAQ UK DVD FAQ (not updated since 12/98) DVD Debate (news, info, and user discussions; mainly region 2) DVD Times (news, info, and reviews; mainly region 2) DVD Reviewer (news, info, and reviews; mainly UK) DVDLink (news and links to hundreds of other DVD sites) Michael D"s Region 4 DVD Info Page (reviews and other info on region 4 discs) DVDUpdate (Dutch) DVDEnFrancais (French, Canada) Dvdfr (French) Area DVD (German) Cinefacts (German) DVDPrime (Korean) dvdnett.no (Norwegian) DVD"mension (Polish) DVDSpecial (Russian) Audio Video Cine en Casa (Spanish) DVD Demystified, by Jim Taylor (the author of this FAQ) Everything You Ever Wanted to Know About DVD, by Jim Taylor (a book version of this FAQ) DVD Authoring and Production, by Ralph LaBarge Desktop DVD Production, by Douglas Dixon From VHS to DVD, by Mark-Steffen Goewecke CD-R/DVD Disc Recording Demystified, by Lee Purcell DVD Production, by Phil De Lancie and Mark Ely