I recently got the GGW-H20L, put it in a system with nvidia 680i MB and XPSP3, had problems with BD-RE - 3 memorex BD-RE did not work, but I can burn dvd or cd disks without problems.
I have another system (same 680i MB) which I have been trying to get Vista running (32bit Home Premium), I took the drive and put it into that system and I did a clean install. When either system boots, I normally see a message about the nvidia volume being healthy on both systems, this system now shows the Blu-ray drive along with the nvidia volume in this same message on bootup, in other words this system shows it under the raid controller, my first one did not do that.
The Memorex BD-RE disks don’t work on this system either, but I got an LG BD-RE from Frys and it does work.
I wasn’t sure if it was the disks or my drive, now I’m wondering about the Nvidia also. The fact that the LG BD-RE disk works suggests that the drive is compatible, but the Memorex disks are not compatible, or maybe just low quality. Now I’m more confused after reading this thread.