I have been using the DRU-500AX for about a month now with no problems. I was even burning some disks last night!! This morning I was backing up a DVD for a neighbor and ran into an error with the burner. It was a dirty disk error and I have never seen it before! I tried all 3 dvd media I have and got the same error message. Funny thing is I was burning on all 3 media brands/types last night and they worked flawlessly. I am using DVDDecrypter and then DVD2One before burning with RecordNow DX V 4.6 I even put in a single layer disk and tried it with DVDXCopy and got the same error message when it went to burn. Did my system get a virus? Is the burner Bad? Please help.