Computer accessories

[Smiley]

If you bought a plu&play firewire cardbus, how do you know it works or not. Plugged it in and connected it to my DVD through firewire cable, desktop does not hsow the Massstorage device. But when connected DVD with the USB2.0 cable to my USB 0, it shows my DVD&CD burner on the Apply System Profile. What should I do if someone has a technical knowledge in Mac and firewire &USB2.0 connectors, please give me an advise. Thanks