magnetic disk: (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored
artifact: a man-made object taken as a whole
adapid: extinct small mostly diurnal lower primates that fed on leaves and fruit; abundant in North America and Europe 30 to 50 million years ago; their descendents probably include the lemurs; some authorities consider them ancestral to anthropoids but others consider them only cousins