I've thought about the same thing, but I suspect the main hurdle to overcome would be recognizing it as a data storage device in the first place. If one had an inkling of that use, then some future archeologist wouldn't need to know much about the electronics or controller. They might image the magnetic fields of the platters at 1000x the resolution and sensitivity of the drives original read/write electronics, then treat it like past archeologists might have treated a tablet with cuneiform.