I have a classroom environment with approximately 20 IMACs running OS X. They dual boot with XP SP2 using boot camp. Because of the nature of the classes, (computer forensics) I need to reimage the IMACs after each class with a "forensically clean" image. In other words, I have to write the entire 500GB hard drive. I am looking for ideas on the most efficient way to re-image these computers. One suggestion I have received is to use a Raptor boot disk with a USB hard drive. (I can't even imagine how long 500GB would take over USB) Firewire would be somewhat faster. Anyone have any better ideas?