Page last updated at 12:21 GMT, Thursday, 7 May 2009 13:21 UK

Compromising data on hard drives

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If you are thinking about upgrading your computer, what do you do with the old one - and all the information on it?

Researchers at the University of Glamorgan have looked at second hand computers and found everything from information about ground-to-air missiles to details about hospital patients, and even private business deals.

Professor Andrew Blyth told the BBC's Wyre Davies about the embarrassing data he had found.

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