About 6 months ago I was running a Sony DVD burner with Roxio software. All of a sudden it would no longer burn -R/W discs. Thinking the burner had gone bad, I bought a new one (I think Samsung) that came with Nero software. Found out it wouldn't burn -R/W either, although it burns -R just fine, and can handle burn to DVD -R/W discs set up as data discs. Have tried other burning programs with same results. It accepts the files it's supposed to burn, goes through all the motions, but the -R/W disc is blank after the burn process. Obviously, something is conflicting, but I have no idea what. Any ideas?