Run the HDDs in a small 'clean room'...
...with just a perspex cover over the opened drives with exposed platters.
The knock at the door means you walk in with a hammer and chisel and go to town on the platters within seconds.
However, being found standing next to a load of destroyed sparking smouldering HDDs would make you look like a guilty puppy sitting next to a pile of poo.
Biting the hand that feeds IT
