Ok I connected my Air to a LG drive GSA-E50L USB DVD drive. It seems to work fine in Windows and OS X. For booting it does work with the OS X dvd's. However, it refuses to boot from a Windows XP installation disk. I've tried different boot disks aswell. No luck. When I boot pressing the option key, the DVD drive is one of the options. It says "Windows CD". I then choose it. It starts reading the CD and then the apple sign is displayed. The apple sign changes into a stop sign and goes back to the apple sign again. Does anyone know what is going on? Has anyone been able to boot from a Windows disk with a non Apple USB drive? Thanks in advance!