Secure HDD wipe

Selling off an old hard drive, I wanted to wipe it clean.

Found the tip here

shred -vfz -n 100 /dev/hda

Here /dev/hda is my whole hard disk. And I am asking shred to make (-n) 100 passes by overwriting the entire hard disk with (-z) zeros. And shred program (-f) forces the write by changing the permissions wherever necessary.

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