This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "DVD formats" – news · newspapers · books · scholar · JSTOR (April 2008) (Learn how and when to remove this template message) This article's lead section may be too short to adequately summarize the key points. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. (November 2015) (Learn how and when to remove this template message)

DVD formats describe the physical properties of the optical disc and how data is stored and manipulated on the disc. The formats are varied according to use, with the largest differences being whether or not the disc is written to. Within each use category, there are often competing formats or implementations.

Non-recordable formats

Recordable formats, supported by the DVD Forum

Recordable formats, supported by the DVD+RW Alliance

Recordable format compatibility

DVD drives from 2004 onward should be able to read either of the competing recordable formats; older drives may read DVD+R discs better. As of 2007, DVD drives typically allow writing to both DVD-R[W] and DVD+R[W] discs, making the difference largely irrelevant to the average consumer.

Application formats

VR Mode, also known as Video Recording mode, is a new format that allows editing and deleting of titles and has defect management. This mode is used by the DVD-RAM and DVD-RW formats. Because it is newer than DVD Video mode, it can only be played back in more recent DVD players that support it.

Video mode is the standard DVD video mode format used by DVD movies. Because the DVD Video format was invented before DVDs were recordable it doesn't allow editing of the disc, doesn't support defect management and is therefore not as robust. Space from deleted titles may not be fully reclaimed until the disc is completely erased. It is compatible with most DVD players. It is used on DVD-RW and DVD-R discs, but has never used for DVD-RAM. Most (but not all) recorders that use DVD-RW will offer the choice of VR mode or Video mode.

+VR was introduced by Philips for use on DVD+RW. The idea was to maintain compatibility with the DVD Video format so it could be played elsewhere, but try and introduce some features as found in the VR mode used on DVD-RW/DVD-RAM. DVD+RW normally uses this mode in set-top recorders. It doesn't need a separate finalise step to play in other DVD recorders; finalisation is just done in the background, which makes it bit easier to use (i.e. you can't forget to do it), but it does put extra wear on the disc, as the same area of the disc is updated every time it is used. Due to DVD-Video not being able to take advantage of defect management and the extra overhead of background finalising after each edit or recording, the +VR mode has always been the least reliable, and the editing features may be missing on some DVD recorders to make it more robust.

Because Video Mode and VR mode are Forum standards, they are only used when recording to DVD approved formats i.e. DVD-RAM/DVD-RW/DVD-R discs. DVD+RW isn't approved by the DVD Forum and manufacturers can't get a license for it to use the above modes, leading Philips to introducing their own +VR mode for use with DVD+RW.

References