Dorothy Hennings said: >Why not, Randy? I have an iMac (original flat panel ) with sometimes >2 or 3 LaCie firewire daisy -chained. Because you are using the same bus for moving your data into and out of both hard drives. Just as it is more efficient to use a four-lane highway instead of a two-lane highway, it is more efficient to have more than one FireWire bus. Randy B. Singer Co-Author of: The Macintosh Bible (4th, 5th and 6th editions) Routine OS X Maintenance and Generic Troubleshooting http://www.macattorney.com/ts.html