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.
Extracted from wiki.
