Wiping out the data that won't die
The undead cause you problems.
Not the ones from horror movies, but the files on your hard drive that you only think you zapped.
Suppose you're reviewing the wide range of skin tones your monitor will display when your wife asks to borrow the computer. Naturally, you erase the evidence.
But you didn't erase the data. That's still on your hard disk. All you did was tell your computer's operating system that the areas on the hard disk where those pictures were stored are now free to store other data. And there's a lot of software, much of it free, that makes data recovery quick and easy.
This can have more serious consequences than being sentenced to sleep on the couch, particularly if your PC contains sensitive information and most do.
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