I used core memory in machines during the 1970s (primarily Data General Novas). There was no problem with physical shock, but we did get errors during strong

I used core memory in machines during the 1970s (primarily Data General Novas). There was no problem with physical shock, but we did get errors during strong thunderstorms. Back then, when I was in highschool, I was told that the density of core memory was limited by the dexterity of the Filipina workers who threaded the wires through the tiny magnetic donuts.