I feel like the book didn't really go that well into the technical parts of most of the storage devices, hard disk drives especially. While it was better covered in the lecture I was befuddled on certain questions on the quiz.
However, while I've heard of degaussing (used to love pressing that button on my old CRT monitors and see the screen go wild), I didn't realize it's application to recycle hard drives. I assumed that it rendered it useless afterwards. Also, looking up the picture of a degausser was a very interesting machine.
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