For unknows reasons, other than the fact that I'm trying to intall Windows 8 beta on a separate partion (and the fact that, well, I AM dealing with Windows <sigh>. I kept ending up with a dead 8GB thumb drive that was dead because Windows, in its infinite wisdom caused the file system to not exist, i.e. become RAW. After LOTS of searching, I finally found a proceedure (which seems about as obscure as you can get) for using the command line to make even a screwed up thumb drive such as mine bootable. In particular, this method will convert the thing from RAW to NTFS if nothing else. So should you need it, check this out.

http://www.intowindows.com/bootable-usb/

try to be more precise in your question

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