It was wiped useing military wipe tech. It just means writing random stuff all over the disk many times. Tech is odd tho, as is magnetism. A faint trace of what it was is left. Read it enough times as 1 or 0 with your detector being at the barely level, you can see what was there. Faint traces remain. The FBI has people that do this for food. It is also why I never resell hard drives. To the shredder thanks, after I drill a couple of holes though the platters.
“To the shredder thanks, after I drill a couple of holes though the platters.”
Hopefully Hillary wasn’t that efficient at wiping her disks.