Confuzzled

They use slightly different laser wavelengths, and there are a few tiny technical differences. You can read a detailed summary of each format here:

http://dvddemystified.com/dvdfaq.html#4.3.2

From a very basic perspective, they're not compatible with each other, though the vast majority of DVD-ROM drives support both major formats. Compatibility among standalone home DVD players is another story--usually they support one format or the other. A great deal of DVD burners support burning of both "+" and "-" formats.
 
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