On Mon 1 Jan,, at 9:26 AM, Peter Sealy wrote: > 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 to all who replied. I now have the info I needed. I apologise for starting a pedantry war! Obviously it was not "... expressed that clearly." ......... Peter Sealy Thurgoona AUSTRALIA