QUESTION: how does one destroy a hard drive deliberately without making it obvious? (e.g. taking hammer to it in your office)

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If I wanted to destroy the hard drive on my computer, I would not know how to do it — except to take a hammer to it and then everyone would know I did it.   Is there a way to do it?  I had an external drive that had all my pictures on it that crashed (no mark on it to indicate there was anything wrong with it on the outside) and I sent it back to the manufacturer.  They spent months trying to retrieve my pictures but no luck.