full-disclosure - Erasing a hard disk easily

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From: aditya.deshmukh at online.gateway.technolabs.net (Aditya, ALD [ Aditya Lalit Deshmukh ])
Subject: Erasing a hard disk easily

> An overwrite with alternating zeros and ones will defer almost anbody, and so 
> will a random-data overwrite, provided both are repeated at least 3-5 times.
> 
> [ the command for dd overwrite with zeros is: dd if=/dev/zero of=/dev/hd? ]

so here are the actual command that you will have to run, 

dd if=/dev/zero of=/dev/hd? ; dd if=/dev/full of=/dev/hd? ; dd if=/dev/urandom of=/dev/hd?

is the addition of /dev/full sufficent ie /dev/zero alternated by /dev/full should do the trick ? ie write zeros and ones on the disk, followed by random writes. done 5 times should it be enought?

-aditya

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