The military crushes and incinerates disks. They must be
completely
destroyed in order to remove any possibility of recovering data
that
they might contain.
Actually, there are two main options: If you want to protect the
data
against someone accessing the disk in software, just overwrite
the
entire contents of the disk. If you want to protect the data
against
someone who uses special hardware to read data off the disk,
however,
you must destroy the disk completely.
That won't necessarily help. Crush and burn, that's the ticket.
