I do need to at some point (been months I have not done) try to rescue genealogy on someone else's hard drive. And I tossed some 10 year old dvds that I could have gotten the data off of. As a reference for myself and a reference to others -
https://anarc.at/services/archive/rescue/
and
https://anarc.at/blog/2018-10-11-cd-archive/
Come from PlanetDebian.
disk destroyer (dd) is not just for copying .iso's to usb sticks.