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Is USB recovery key for Surface Pro universal or unique to the system


Does the recovery image created on the USB key you make contain the Windows 8 product key, serial number or any other unique information for the specific system the recovery files were generated from?
I'm wondering if we had 100 Surface Pros, would we need 100 USB sticks labeled with individual serial numbers for restoring each tablet or could we just make one key and use it as needed to restore any Surface Pro?