CHEATSHEET WIPE HD
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How to Wipe Hard Drive Clean Using dd Command in Linux

Wipe Entire Disk = Filling the disk with all zeros:
# dd if=/dev/zero of=/dev/sdX bs=1M 
(Filling the disk with all zeros)


for security, you should populate it with random data rather than zeros:
# dd if=/dev/urandom of=/dev/sdX bs=1M *replace X with the target drive letter.


Wipe Master Boot Record (MBR):
dd if=/dev/zero of=/dev/hdX bs=446 count=1

Wipe Partitions:
# dd if=/dev/zero of=/dev/sdX2 bs=1M
or
# dd if=/dev/urandom of=/dev/sdX3 bs=1M  (secure)