How to completely erase a hard disk

[Gabriel Dragffy]

On 1 Oct 2007, at 03:31, Twist O'Connor wrote:

> umm yea you can really just use the ubuntu live cd and manuelly  
> setup your partitions..... i suggest alternet cd for more control  
> over your situation
>

That didn't work. I tried deleteing all partitions, reformating them  
before and after, and even reformating the block device dd if=/dev/ 
zero was the way I found. But you could use mdadm --zero-blocks  but  
that didn't work for me for some reason.