hi , it seems I have the same problem: "sessions at once and disc at once audio writing are not supported on this drive", though it used to be! I tried on my second drive and it's the same problem. I heard that the problem might be coming from the ASPI layer, but it's not (of course...), because I checked. I even reinstalled windows xp (because of fatal error somewhere else), reinstalled cdburner xp (version 3.0.116), but I still can't write audio files as "disc-at-once"... I really don't think it's a hardware problem. If you have any idea how to fiw this, I'd be really greatful. thanks a lot!