Oh cool. Reminds me of the Commodore 64 days; there was a floppy disk copy program that could run using the drive's controller. Since the floppy drive had its own power supply that meant you could actually turn the computer off and copy floppies. It was pretty pointless but just a cool trick.
If you haven't read the one where he installs Linux on a hard disk, here it is: https://spritesmods.com/?art=hddhack