Just a simple hole renders them useless. The only method to reconstruct them from there would be any kind of SEM or AFM which would still take weeks to months to years depending on the size/density of the drives.
Even just opening them up and smacking the disks would be sufficient
Next time just encrypt them.
On most systems copy pasting is heavily insecure since a lot of processes have access to the clipboard. autotype and thinga like browser extensions are considered more secure.