I'm running SL. I have a MBA, an iMac, and a LaCie external drive. I want to plug the MBA into the USB port on the external drive and the iMac into one of the Firewire 800 ports on the external drive. (On the LaCie, I have two backup partitions for each of the computers -- one for backups and one for a CarbonCopy clone of the computers.) When I connect them this way, the iMac can see the drive, but the MBA can't. The MBA will see the drive only if I unplug the iMac from the drive. Is there some sort of trick for getting both computers to see the drive at once? I don't care if they see all four partitions; I'd just like the MBA to be able to see "its" TM and CCC partitions on the LaCie and the iMac to see "its" partitions. Thanks for the help.