The Prolific PL-3057 chipset is crap! I have gone through 4 enclosures using the chipset, FireWire did not work at all on any of them, and after updating the firmware, USB2.0 died as well. If you want both USB2.0 and FireWire, do not get a enclosure with the Prolific PL-3057 chipset, it's not worth the savings!