The USB device that you are attempting to install EXS onto has probably already had it installed on it. I am guessing that the MBR on that USB device is write protected. You will have to either try a new USB device or attempt to do a low level format of the device or format it with some other Linux. Low level formats take forever but it could be the solution to your problem. Feel free to further contact me, my info is under my profile if needed. Best of luck and I hoped this works.
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