I have just setup an External Firewire drive 1TB with osx 10.56 on it and it does seem to be running fast Hooked up to a 2007 iMac so I believe its firewire 400 that it's using. My question is if it's recommended to run a real production OS from an external Iomgea Ultramax 800/400/USB/ESata drive. Listed here http://go.iomega.com/en-us/products/external-hard-drive-desktop/ultramax-single/?partner=4760 Is there anything special about runing from an external i should be aware of? Reason I wanted to use external vs internal is size. Im using the internal HD for bootcamp and Virtual Drives while my main production and family storage is on the external.