Data recovery

From wikinotes

Data Recovery is painful, and professional help is prohibitively expensive. There is little that you can do in the event of a disaster, but these utilities may be able to help you out of a crisis.

HDD Recovery

ddrescue disk-image without damaging new disk, prevent hangs with max-retries

Data Shredding

wipe program to wipe files within a filesystem (not very useful)
shred program to wipe an entire disk