This discussion came up on one of the SANS lists recently and unfortunately I didn't save the thread for the references but there is research showing that if you have a well funded advisory you are better off wiping the drive once than physical damage to a level less than than total shredding. This makes sense when you think about it. If you drill say three 1" holes in a 3.5" drive you have left most of the platter undamaged. Thus a data recovery house can recover all or most of the data in the undamaged area. Back in the days of floppies there used to be a company that had an advertising campaign showing a pencil shoved through a floppy and they bragged about how much of the data was recovered. It's expensive but it's also possible to recover from physical damage of hard disks. Current theory/tests hold that a single wipe is sufficient on modern hard drives. If I remember correctly this has to to with denser data and less room for error. DBAN is great for wipes as long as the disk doesn't not have errors that cause DBAN for die. In those cases I do physical damage and hope for the best and assume that no one really wants my data badly enough to go to the trouble of paying for recovery. Within a short period I will be starting to encrypt all my drives at work so this will be less of an issue but I'll still wipe when possible just to be safe.
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