Any idea if its possible to copy an XP disk to a flash drive and install XP from there?
Logic tells me it should be possible, but this is M$ protectionism we’re talking about…
Afaik,no due to not having the USB drivers present. I think its possible with a bit of hacking (google is your friend here) but not from just dropping the ISO onto a drive.
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As Drezha pointed out it is more than doable… and I have done it many times 
But I have a external DVD drive… You could borrow it if you where local…
Also used this one more than once to install XP : http://komku.blogspot.com/2008/11/install-windows-xp-using-usb-flash-disk.html
Good link Sheepy! 
Cheers chaps