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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 --now known as the DVD+RW Alliance-- in mid 2002 (though most initial advocacy was from Sony). Since the DVD+R format is a competing format to the DVD-R format, which is developed by the DVD Forum, it had not been approved by the DVD Forum, which claimed that the DVD+R format was not an official DVD format until 2008-01-25.citations needed
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.
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". Thus, a DVD+R disc can have the RW logo, but it is not rewritable.
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