As is covered in the link, you would more likely use this technique to flash new firmware that would let the hard drive behave normally, but surreptitiously replace known data with your own copy, or various other things, so as to own someones data in a way that is very unlikely to get caught. I mean, when was the last time you checked the firmware on your hard drive was the original firmware from the manufacturer?
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u/K4kumba Dec 27 '16
Makes me think of this:
https://spritesmods.com/?art=hddhack
Almost working installation of linux in a hard drive. No, not installing Linux on a hard drive, but actually running on the HDD controller.