By chance I dropped a NEC based generic USB2 card in a graphite G4 running OS 9. Worked fine without drivers, it loaded a USB2 flash stick but I didn't test the speed, although it didn't work in a dual 1.8ghz G5 PCI (not the PCI-X model). This is the model $13 CAD http://www.canadacomputers.com/index.php?do=ShowProduct&cmd=pd&pid=003053&cid=IOC.313.574

Have you tried connecting your QS to you DA with a Firewire and Target Disk Mode?