I was wondering if the iMac will reduce the speed the data if I connect a firewire 400 device to the firewire 800 connection on the iMac? What I'd like to do is connect an external harddrive firewire 800 and then daisy chain an old photo printer to the external harddrive. The photo priniter is firewire 400. If I did this, would it then reduce the ext hd from fw 800 to fw 400?