I have an external 400 Firewire HD which I connect to my TiPowerBook as necessary to clone/backup my PowerBook system. When I buy a new computer which has Firewire 800 speed will my 400 HD still run on the new computer albeit at the slower 400 speed. I know those speeds are theoretical but I guess what I am asking is if a 400 HD is compatible with an 800 port on a new computer. I hope I have expressed that clearly. Thanks ......... Peter Sealy Thurgoona AUSTRALIA