DVD+R: Difference between revisions
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[[Image:Sony Single DVD+R.JPG|thumb|right|A single DVD+R disc]] |
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A '''DVD+R''' is a once-writable [[optical disc]] with 4.7 [[gigabyte|GB]] (4.377 [[GiB]]) of [[computer storage|storage capacity]] (more precisely, 2295104 sectors of 2048 [[byte]]s each). It has slightly less [[computer storage|storage capacity]] than the [[DVD-R]] (4.382 [[gibibyte|GiB]]). The format was developed by a coalition of corporations, known as the [[DVD+RW Alliance]], in mid [[2002]]. Since the DVD+R format is a competing format to the [[DVD-R]] format, which is developed by the [[DVD Forum]], it has not been approved by the DVD Forum, which claims that the DVD+R format is not an official DVD format. |
A '''DVD+R''' is a once-writable [[optical disc]] with 4.7 [[gigabyte|GB]] (4.377 [[GiB]]) of [[computer storage|storage capacity]] (more precisely, 2295104 sectors of 2048 [[byte]]s each). It has slightly less [[computer storage|storage capacity]] than the [[DVD-R]] (4.382 [[gibibyte|GiB]]). The format was developed by a coalition of corporations, known as the [[DVD+RW Alliance]], in mid [[2002]]. Since the DVD+R format is a competing format to the [[DVD-R]] format, which is developed by the [[DVD Forum]], it has not been approved by the DVD Forum, which claims that the DVD+R format is not an official DVD format. |
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Revision as of 06:21, 30 December 2007
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A DVD+R is a once-writable optical disc with 4.7 GB (4.377 GiB) of storage capacity (more precisely, 2295104 sectors of 2048 bytes each). It has slightly less storage capacity than the DVD-R (4.382 GiB). The format was developed by a coalition of corporations, known as the DVD+RW Alliance, in mid 2002. Since the DVD+R format is a competing format to the DVD-R format, which is developed by the DVD Forum, it has not been approved by the DVD Forum, which claims that the DVD+R format is not an official DVD format.
In October of 2003, it was demonstrated that double layer technology could be used with a DVD+R disc to nearly double the capacity to 8.5 GB per disc. Manufacturers have incorporated this technology into commercial devices since mid-2004 (see DVD+R DL).
Unlike DVD+RW discs, DVD+R discs can only be written to once. Because of this, DVD+R discs are suited to applications such as nonvolatile data storage, audio, or video. This can cause confusion because the DVD+RW Alliance logo is a stylized "RW" (See image, below). Thus, a DVD+R disc can have the RW logo, but it is not rewritable.
The DVD+R format is divergent from the DVD-R format. Hybrid drives that can handle both, often labeled "DVD±RW", are very popular since there is not a single standard for recordable DVDs. There are a number of significant technical differences between the "minus" and the "plus" format, though most consumers would not notice the difference. One example is the CD+R style ADIP (ADdress In Pregroove) system of tracking and speed control being less susceptible to interference and error than the LPP (Land Pre Pit) system used by DVD-R, which makes the ADIP system more accurate at higher speeds. In addition, DVD+R(W) has a more robust error management system than DVD-R(W), allowing for more accurate burning to media independent of the quality of the media. Additional session linking methods are more accurate with DVD+R(W) versus DVD-R(W), resulting in fewer damaged or unusable discs due to buffer under-run and multi-session disks with fewer PI/PO errors.[1]
Like other "plus" media, it is possible to change the book type to increase the compatibility of DVD+R media.
As of 2007, the market for recordable DVD technology shows little sign of settling down in favor of either the "dash" or "plus" formats, which is mostly the result of the increasing numbers of dual-format devices that can record to both formats; it has become very difficult to find new devices that can only record to one of the formats. However, because the DVD-R format has been in use since 1997, it has had a five-year lead on DVD+R. As such, older or cheaper DVD players (up to 2004 vintage) are more likely to favour the DVD-R standard exclusively,[citation needed] and when creating DVDs for distribution (where the playing unit is unknown or older) the DVD-R format would normally be preferable.
Recordable DVD capacity comparison
For comparison, the table below shows storage capacities of the four most common DVD recordable media, excluding DVD-RAM. See articles on the formats in question for information on compatibility issues.
| Disk Type | number of layers | number of sectors for data (2,048B each) | capacity in bytes | capacity in GB | capacity in GiB |
|---|---|---|---|---|---|
| DVD-R | 1 | 2,298,496 | 4,707,319,808 | 4.7 | 4.384 |
| DVD+R | 1 | 2,295,104 | 4,700,372,992 | 4.7 | 4.378 |
| DVD-R DL | 2 | 4,171,712 | 8,543,666,176 | 8.5 | 7.957 |
| DVD+R DL | 2 | 4,173,824 | 8,547,991,552 | 8.5 | 7.961 |