There really isn't any. There are a few dvd players that only support +r/+rw dvd backups but that is about it. -r/-rw is much more widely used. You can see what media your dvd player can play here.
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[size=3][color=red][b]Retired[/size][/b][/color]
[size=2][color=blue][b]
US V7 PS2 w/ Apple Pro
Pioneer DVR-112D
LG GCC-4480B 48X24X48X16 CD-RW/DVD-ROM Combo[/color][/b][/size]
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