I am a new mac user, since October, I am sold, and very happy with leopard, (time machine). the best party trick ever….. and I did have to use it yesterday. brings me to my question, I have a Imac with a 500gb hard drive, now not thinking fully i raced out and got a maxtor one touch 3 320gb, with firewire and USB, I am using firewire 400 , frees up a usb for other stuff. so now i am at home and have released that i perhaps should have bought a bigger external drive then the one in the machine. ******What i would like to know is it appears to have 2 firewire ports at the back, can i just get another 300gb and plug it in their ? is that a raid ?… will it work as a raid?… how do i tell ?