dead jumpdrive

Hello everyone. I have a 256 mb lexar jumpdrive secure that just died one day, after being very useful for about three months. I plug it in my windows and mac computers and it is not recognized. On the windows computer, it tells me an "unknown device" is connected to a usb port. Is this some sort of firmware problem? I've looked at the lexar website, and it does not seem to offer any drivers or firmware. Any idea What could have killed this drive overnight? Thanks.
 
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