<Regarding several posts about PowerBook drives not working in an external enclosure off FireWire power.> I have to say the problem most likely isn't the enclosure. If the drive takes more power than the FireWire bus can deliver, no enclosure will work without an external power source. These enclosures are just that, an enclosure with a couple plugs'n cables. To make it work, you really need to know how much power the drive requires and compare that to how much power your computer's FW bus supplies. Keep track of any other devices which may be drawing power from the FW bus as well (i.e. an iPod). I really don't know for sure, but my impression was that some portables didn't supply any power via the FW bus and some supplied only a limited amount. -Mike