Any reason I can't install Leopard on a USB drive from my iMac, then move the drive to my Air and boot that? It's just for emergency purposes, so if trackpad gestures are missing or something, no big deal. I just want a DiskWarrior drive I can use on all my Intel Macs--especially the Air with no DVD drive. (I know I could install OS X using the Air itself--but wireless installation would be slow. Better to install OS X quickly on my iMac via USB.) Thanks in advance!