[[If I bake my old Seagate and Samsung hard drives in the oven at 500+ degrees for four hours, will that make them safe enough for the landfill or would I still want to take a ball-peen hammer to them?]]
If you have access to a drill with metal bit, drill 3-5 holes through hte disks- and then as extra precaution take a sledge hammer to it- but really- people aren’t going through landfills looking for hard-drives to steal info from usually- the risk is very very small- You coudl also disassemble the whole thing and scatter the 4 disks *(after smashing them up) to the 4 winds-
10-4!