What does DVD+RW be set to? As argue with to DVD-R?
Answers: Well, there are really one and only two "families" of DVD at the moment (unless you want to count the red laser vs. blue laser stuff that's starting to come on to the market at the large end), and one "outcast". You've got the "minus" ("-") formats (DVD-R, DVD-RW) and the "plus" ("+") formats (DVD+R, DVD+RW), consequently there's the older DVD-RAM format that's harder to find today. All of these are for data, logically -- all but the most modern DVD video players will choke on those, in duplicate way untimely CD players choked on CD-R discs.
A DVD-R is a write-once format: once you've burned the facts onto that DVD platter, the disk is forever frozen with that information. Add the "W" to that, and you'll find that DVD-RW can be erased or rewritten up to a thousand times. Seems kinda unusual, but if you can do so, DVD-RW obviously have significant advantages over DVD-R. DVD-RAM was even more flexible, however, since it permit you erase and rewrite sections of an existing DVD, something that you cannot do next to DVD-RW.
Moving to the plus side is where things find a bit confusing, because DVD+RW came since DVD+R. The plus formats have matching data storage dimensions as the minus formats (4.7GB), but DVD+RW offers faster writing, better internal linking (a controlled obscurity you don't have to verbs about), and support for drag-and-drop desktop files, which makes it unproblematic to compose the contents of a disk. DVD+R is a write-once format intended to be more compatible with more DVD players, though at this point it seem to be about even next to DVD-R, which remains the most compatible computer-burned DVD format.
DVD-R - recordable once
DVD-RW -rewritable
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