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+--- Thread: What's the difference between the various DVD reco (/thread-2967.html)
What's the difference between the various DVD reco - KobrAs - 2004-12-29
Currently there are many writeable and rewriteable DVD formats on the market, and this can be confusing to the average consumer. These DVD formats include:
DVD-RAM
DVD-R
DVD-RW
DVD+R
DVD+RW
DVD-RAM
DVD-RAM is a sanctioned format of the DVD Forum, a consortium of companies involved in the development of DVD standards. DVD-RAM was a format originally aimed primarily as a data solution, but it is now becoming popular as a video format used by some brands of standalone (non-PC) DVD recorders. DVD-RAM is a very robust data storage solution, theoretically allowing greater than 100000 rewrites per disc.
Early PC-based DVD-RAM recorders used 2.6 GB discs (or double-sided 5.2 GB discs), but current drives also use 4.7 GB discs (or double-sided 9.4 GB discs). DVD-RAM discs are traditionally housed within cartridges, so that the media is well-protected. Originally, the cartridges could not be opened, but newer Type II and Type IV cartridges can be opened, an important feature for those who wish to read these discs in DVD-RAM compatible DVD-ROM drives or standalone DVD players. In addition, some DVD-RAM discs are now sold without cartridges.
In addition to support of the usual DVD UDF formats, DVD-RAM also allows fully integrated OS-level random read/write access similar to hard drives, with both Windows XP (with FAT32) and Mac OS X (with FAT32 or HFS+), as well as on-the-fly write verification.
The main drawback of the DVD-RAM format is its limited read compatibility by DVD-ROM drives and standalone DVD players. DVD-RAM read support with these units is increasing however, partially because of the increasing popularity of home standalone DVD-RAM recorders in home theatre systems.
DVD-R and DVD-RW
DVD-R and DVD-RW are also both formats of the DVD Forum. Both formats generally use 4.7 GB discs, although some professional DVD-R drives use 3.95 GB discs.
DVD-R is a write-once recordable format which allows excellent compatibility with both standalone DVD players and DVD-ROM drives. There are two main types of DVD-R discs: DVD-R for General Use and DVD-R for Authoring. Most consumer DVD-R burners use the cheaper General Use discs, while some professional burners use Authoring discs. The correct media type appropriate for the recorder must be used when burning a DVD-R. However, once written, the discs should be readable in either drive type. (General Use DVD-R is designed to prevent backup of encrypted commercial DVDs.)
DVD-RW media uses rewriteable discs which are rated for more than 1000 rewrites in ideal situations. The majority of standalone DVD players will play video recorded on DVD-RW discs, but the compatibility is not as high as with DVD-R.
Current DVD-RW recorders also record to DVD-R. However, the reverse was not always true. Some older DVD-R recorders were not capable of writing to DVD-RW discs (although some were able to read DVD-RW discs burned with other drives).
DVD-RW and DVD-R have heavy penetration into the professional multimedia market as well as the general consumer market. For instance, the Apple SuperDrive, found in many pro and consumer Mac computers, is simply a DVD-R/DVD-RW (and CD-R/CD-RW) capable burner.
DVD+R and DVD+RW
These two formats are backed by the DVD+RW Alliance. While these formats are not supported by the DVD Forum, several members of the DVD+RW Alliance are also members of the DVD Forum. These discs are very similar to DVD-R and DVD-RW in design, usage, and compatibility.
DVD+RW, like DVD-RW, is a rewriteable 4.7 GB format, and overall it has similar functionality to DVD-RW. The level of compatibility of standard DVD+RW discs in standalone DVD players is similar to that of DVD-RW. The rewritability of DVD+RW is also said to be similar to that of DVD-RW, allowing up to 1000 rewrites.
One potential advantage of the DVD+RW format is Mount Rainier (DVD+MRW) drag-and-drop file access support planned for Longhorn, a future version of Windows slated for release in 2005. Older DVD+RW drives do not support this function, but newer drives may. While DVD+MRW is arguably not as robust a data solution as DVD-RAM, DVD+MRW potentially will offer higher read compatibility in current DVD-ROM drives.
DVD+R is a format that was introduced to consumers in early 2002. The first generation +RW recorders did not support DVD+R recording, and likely cannot be upgraded to do so. However, all current models of DVD+RW recorders also support DVD+R recording. Compatibility of +R discs in standalone DVD players is similar to that of DVD-R.
Can I have it all?
Support of combinations of several of the formats are available in many current drives. Recorders that conform to the DVD Forum
What's the difference between the various DVD reco - anyweb - 2004-12-29
on a related note, when downloading DVD iso's (like fedora) some ftp programs cannot see above 2 gb and the 4.3 gig DVD doesnt download correctly,
fyi
cheers
anyweb