My Sony Dru 800a stopped writing to Dvd-R dual layer discs. I have the KY06 firmware and am using Verbatim Dvd-r dl discs. When I put it in the drive it classifies it as an "ML disc" and says that the compilation cannot be burned to it. I have burned Verbatim dvd-r dual layer discs before with the same drive, but now it doesn't work. Please help.