My “I’m a CS” colleagues all tell stories about the OS they created in uni. A couple of them were happy stories.
https://ocw.mit.edu/courses/6-828-operating-system-engineering-fall-2012/
It’s good to know how to do it, but there is not much need to go and do it.
It’s in the lexicon, but not the vernacular…
One anecdotal data point to consider… They might be really loud.
I am running a few 3TB drives that were formerly enterprise SAN drives, cleaned and sold for cheap. They work just fine (we won’t talk about game loading times here), but they are very audible clacking away when the head seeks.
Hitachi Ultrastar 7K4000 HUS724030ALE641 3TB 64MB cache Internal Hard Drive
https://imgur.com/fjord-norway-1920x1080-FZitCZy
Never been, but would like to visit someday.