I may soon buy one of the newer generation iMacs that drop the FW400, includes 800 only. On my current Mac, I have a FW800 drive and a FW 400 drive. I use the 400 for time machine as speed is less important. My current iMac has a 400 & 800 connector. I have tested connecting the 400 to the 800 drive via daisy chaining, so everything is pulling off the 800 connector, so this assures me I can do this with the new iMac. However....... Does it slow down your 800 drive when it has a 400 chained off of it? Or, if the 800 is the first drive connected to your iMac, do you maintain full speed? Thanks for the help.