....my Sony DRU-500A says, via WinXP Home, that 'no disk is inserted', when I put a Ritek G04 4X disk in the tray. Can't figure out why. Am trying to use DVDXCopy or DVDXpress to back up a DVD. Can't recall having this problem before, and recall burning the G04s with my 2.0f firmware upgrade. Any ideas out there. Where am I screwing up? BTW CD DVD Decrypter and Nero Info Tool give me the same results. Same results on Meritline's 4X disks.