[Ilugc] Overwriting hard disk

Kapil Hari Paranjape kapil at imsc.res.in
Wed Dec 10 23:11:19 IST 2008


Hello,

On Wed, 10 Dec 2008, Arun Khan wrote:
> One of my hard disk is showing symptoms of impending failure. Before 
> sending it for replacement, I would like to blank out the entire disk 
> (80GB in my case).
> 
> Is the following sufficient?
> dd if=/dev/zero of=/dev/sdb1 bs=1K count=78148161  (sdb1 is the entire 
> disk - MBR)

I think you should probably blank /dev/sdb rather than /dev/sdb1.

Also if the person who buys your disk wants to analyse it
magnetically and has the equipment to do so :) then this is not
enough.

In that case you need to run something like "shred".

Kapil.
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