But, when you wipe a drive, the enter drive is overwritten with junk data.
This should, the theory goes, make it impossible for someone to recover the deleted file. “Secure delete” utilities attempt to solve this problem by not just deleting a file, but overwriting the data with either zeros or random data. If you have sensitive data - for example, business documents, financial information, or your tax returns - you might worry about someone recovering them from a hard drive or removable storage device. This is still possible on USB flash drives and SD cards, too.
But that file’s data was still sitting on the hard drive, and file-recovery tools could scan a hard disk for deleted files and recover them. The operating system would mark the file as deleted, and the data would eventually be overwritten. Traditionally, deleting a file from a mechanical hard drive didn’t actually delete that file’s contents.
RELATED: Why Deleted Files Can Be Recovered, and How You Can Prevent It
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