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How to wipe a hard drive clean

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#26
You can use DBAN, ErACE, etc. They will over write whole hard drive. So it is impossible to recover data with any recovery tool
 
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#27
Delete partition, recreate partition, reformat. That will deal with a lot of it, but 256bit or higher dod wiping is best for the paranoid, but really over the top for most uses.
 

Aquinus

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#28
I have to agree with @n0tiert , disk destroyer (haha) is probably the best free tool to use imho, however I wouldn't use /dev/urandom or /dev/random as they add overhead, /dev/zero would probably be faster.
Code:
sudo time dd bs=1M if=/dev/zero of=/dev/sdx