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When you hit delete on a file, in most cases, those 1s and 0s aren’t actually erased. Just because the file has been deleted doesn’t mean it’s gone. The operating system just marks the space they’re taking up as free for new stuff. So until a new file overwrites that particular space on the hard drive it can still be recovered.
If you want those files permanently erased, as in gone forever, you need to do more than simply delete them. What third-party eraser tools do is wipe over your sensitive files with random data, so not even the best recovery utility on the planet can bring them back.
Or at least that’s true for traditional hard drives. Modern solid-state drives (SSDs), and the flash memory in mobile phones, don’t work in the same way. If you are using a SSD drive, deleted files are harder to recover once they’ve gone beyond the Recycle Bin or Trash anyway.