What_does_this_button_do?, Fdisk can be recovered from as it only sets up a partition table.
Flyswift, For a real powerfull magnet take the ones out of the drive itself.
pax anglia, why not dismantle the disk drive, they are great fun, especially running them with no cover on and pouring in sugar!
PS. what have you got thats so confidential, have you gained a machine from some 70's pop star ?