Reading an article about the ultimate USB stick on the BBC reminded my about a patent that was awarded to Microsoft for a forgetful USB. A google search later I found a article Microsoft patents self-destructing USB key for forgetful types http://www.engadget.com/2006/11/20/microsoft-patents-self-destructing-usb-key-for-forgetful-types/ the self-destructing USB memory keys, with enough battery life in them to power the key for one hour, after which the data disappears completely.
This was Microsoft's solution to copying secure configs between devices on a wireless network, although it could be used for any secure config transfer. In case it got lost then the data would be automatically deleted when the device lost power. All well and good if it took less than an hour to get between locations.
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