Several of us are having this problem. There are several threads in the www.apple.com "support" "discussions" area but no real solutions. If you get as far as disk utility wanting you to "initialize", you've made it further than I have. Mine is a StorTec external bought from DealSonic. I've tried putting a Hitatchi 80gig, Maxtor 160, and WD 250 gig, and none of them will mount. I tried setting the jumper to cable select, then master, then slave, then back to cable select. Do you possibly have a "dead" firewire port? It's been mentioned on MacFixit also. Apple has a solution to resetting your firewire port if that's a problem but other than that, no one has been able to help me. The enclosure could be bad but it was so cheap, it wouldn't have been smart to return it, since DealSonic charges re-stocking, etc. Ron/TN On May 10, 2005, at 7:03 PM, Neil Poese wrote: