Hi. My Quad G5 (running Leopard, latest downloads) has an odd issue. It had it on Tiger also, so I don't think Leopard is the issue. Any discs I burn on this machine will work fine on any other machine, but if I then try to read them on the Quad, it thinks they are empty. This is with the built in software, Toast, anything. I've run a lens cleaner through it. The drive is a: HL-DT-ST DVD-RW GWA-4165B if that helps? Any help would be great, it's getting frustrating to have to read things over a network! Take care, L.