i think you guys are trying to get a little too complicated
xboxhdm needs to BOOT.
so, if you could make your windows boot off a usb drive, then yes you would be able to.
so if you modify the ini for the boot procedure, the spot where most people would put the location of their primary drive or cd drive, you could put in the usb location (sorry i dont know what exactly that would be, something with pci in it or well idk)
so basically, i dont think your question is can you use xboxhdm from a usb cd drive, i think you should be asking
whether or not you can boot from a usb cd drive, no?
anyways, i dont kno if that was helpful in any way at all
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but i think the best thing is to just find out for yourself and show and tell for kiddies in the future
EDIT (WHOOPS)
haha sorry i didnt understand what you meant hero...
when i read it the second time i realized you WERENT getting complicated or anything and you basically said exactly what i did...... silly me
![tongue.gif](style_emoticons/default/tongue.gif)