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A propietary re-writable DVD format, developed by DVD+RW Alliance. Format allows single-layer data to be stored on each side of the disc -- in other words, one side of the disc can hold upto 4.38 gigabytes of information (NOT 4.7GB what the disc labels claim -- 4.7GB is achieved by tweaking the numbers and using 1,000 in calculations between megabyte and gigabyte, when the correct number to be used should be 1,024). Dual-layer discs that could hold 8.5GB don't exist and most likely never will due technical limitations. This poses a problem when backing up pressed DVD-Video discs that can hold dual-layer worth of data per side, 8.5GB. Those discs need to be split to two DVD+RW discs if all the information has to be preserved from the original disc.
DVD+RW is technically slightly more advanced than its competitor, DVD-RW. But the year 2002's projections of blank media sales show that sales of DVD-RW dominate the rewritable market by ratio of 75-to-25 when compared to DVD+RW.
Both, DVD+RW and DVD-RW, formats are re-writable formats. DVD+RW's "sister format" is called DVD+R which is essentially a record-only-once version of DVD+R. DVD-RW's sister format is called DVD-R.