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I moved this thread to the Lite-On DVD burner forum, where someone in this section may be able to help. The Lite-On DVD recorder forum is for Lite-On set-top DVD recorders, i.e. the DVD equivalent of a VCR.
One thing worth trying is carrying out a full erase with the Dell laptop's DVD burner to see if this works. A full erase takes a while depending on the disc (~15mins for 4x DVD+RW or ~9mins for 10x CD-RW)