After upgrading my 2010 Mac Mini to Lion, I started having performance issues with my FW800 connected drives. Serious lag and beach ball issues, none of which existed on 10.6.x. Now, after applying 10.7.1, I can't even boot the Mac with the FW800 drives connected... you can imagine how long it took to figure that out after updating. ARGH! I'm forced to use USB. Anyone else seeing issues with Firewire? BTW, my enclosure uses and Oxford Semiconductor chip.