Device: LG GSA-4040B Media: Memorex DVD+RW 4.7GB 120 min. Software: Nero 6 Ultra Edition. I wrote data to DVD+RW media using Pinnacle Studio 8. Now that I want to erase that data from the media, Nero gives me "illegal disc" error. Never seen that message before. Other than that, DVD-R's are working fine. What can I do?