I'm wondering about drawbacks or benefits of creating a chain of two FireWire drives looped back to one computer. I intend to setup two external 1TB drives as either a single 2TB concatenated RAID array or a striped RAID 0 array to be used as a Time Machine backup volume. All ports and cables are FireWire 400. The setup in question would be: Setup 1 (loop) Mac FireWire Port 1<--->External Drive A FireWire Port 1/External Drive A FireWire Port 2<--->External Drive B FireWire Port 1/External Drive B FireWire Port 2<--->Mac FireWire Port 2 vs. Setup 2 (one long chain) Mac FireWire Port 1<--->External Drive A FireWire Port 1/External Drive A FireWire Port 2<--->External Drive B FireWire Port 1 vs. Setup 3 (two short chains) Mac FireWire Port 1<--->External Drive A FireWire Port 1 Mac FireWire Port 2<--->External Drive B FireWire Port 1 <---> = FireWire 400 cable According to Apple, (regarding FireWire 800): In fact, you can even loop your FireWire 800 chain back to your Mac for redundancy while performing live. However, according to FireWire Depot: When you are connecting devices to your computer, don't make a second connection between two devices that are already part of the tree. The devices will not work properly because the transmission of the second connection is blocked and forms a loop within the tree arrangement. Unless I'm not understanding this, these two statements contradict each other. I tend to believe Apple since they are responsible for much of FireWire's development but such a blatant contradiction makes me wonder. Would anyone be kind enough to shed some light on this?