Differences between version 7 and predecessor to the previous major change of DVD.
Other diffs: Previous Revision, Previous Author, or view the Annotated Edit History
| Newer page: | version 7 | Last edited on Sunday, April 29, 2007 2:54:45 pm | by LawrenceDoliveiro | Revert |
| Older page: | version 6 | Last edited on Friday, December 2, 2005 1:41:51 pm | by MattBrown | Revert |
@@ -1,9 +1,13 @@
-[Acronym] for __D__igital __V__ersatile __D__isc.
+Optical disc format which is an evolution of the older CompactDisc format. Originally an
[Acronym] for __D__igital __V__ideo __D__isc, then this was changed to
__D__igital __V__ersatile __D__isc, then finally it was deemed to stand for nothing at all, so that it could be trademarked
.
(See DiskVsDisc)
-Has ~7 times as much storage capacity
(4
.7[GB])
as a [CDROM]
.
Now being used a lot more in the [PC] world as many computers come with DVD drives for reading or for read/write.
+DVD is an evolutionary, rather than a revolutionary, development of the same basic CD technology. By the mid 1990s, red-light lasers had become cheap enough to be incorporated into mass-market technology
(as had happened with infrared lasers at the time of the introduction of the original CD)
. The shorter wavelength allowed the data density to be increased. This, along with improvements elsewhere in the tracking and reading systems, etc allowed the total amount of data stored to be increased by a factor of about
7. DVDs can also have two layers, and this doubles the data storage yet again.
+
+Another difference is that the CD were originally developed
as an audio format, which was then adapted to become a computer data format. Whereas the DVD was developed from the beginning as a computer data format, which also happens to be usable for video, audio and other applications. Thus, whereas with CDs the CD-ROM data format is a special variation of the basic CD-Audio format, with DVDs it is the other way round: all DVDs are effectively "DVD-ROM" discs, and the DVD-Video format is a special case defined by
a particular file structure on the disc
.
+
+
Now being used a lot more in the [PC] world as many computers come with DVD drives for reading or for read/write.
To play DVD movies, you need the [DeCSS] tool. Most distros do not include this because of legal threats from the media industry, so you need to download it separately.
There are some [DVDWritingNotes] found in this Wiki.
