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All data that is stored in your digital storage device is stored as bytes. It is difficult for humans to work with bytes directly. Hell, it’s difficult even for computer programs running on operating systems to work with bytes directly all the time. That’s why there are also file systems, so programs and humans can manage files, not bytes. When you delete a file, you’re not really deleting them, you’re just telling the file system to ignore it so you can reuse that space on the hard drive later. But what if you want to make sure a file, or an entire device, is really erased?