It's as simple as that. I've attached my external drive to my 17 inch macbook Pro, on the wirewire 400 port, and it shows up under the profiler as as "Unknown device". The same drive looks fine on my iMac OS version on both machines is 10.5.2. If I use the USB2.0 port on the drive and connect it to either machine it can be seen by both. Any ideas?