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Why not use a LiveCD?
Wait... the OS is too big.
Ok then, a LiveDVD.
Oops, still too big!
Maybe Live-Blueray or Live-HDVD might work...
Sure, a live HD-DVD would be fun. Just make sure you have 10 GB of RAM and a 4 GB flash drive in the USB port.
WTF has LiveCD doing fact that you can run it thru internet. You dont have to install anything or reboot your computer! Totally different than some crappy LiveCD.