How to Securely Wipe a Hard Drive on Your Mac

Thinking of giving an old hard drive to a friend, or taking it to be recycled? Be careful. When you delete a file on a mechanical drive, it’s not really gone—at least, not physically. Your file system marks the spot taken up by the file as “free space,” which is why you can sometimes recover deleted files.

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by Justin Pot via How-To Geek