[CentOS] Utility to zero unused blocks on disk

Tue Feb 9 07:59:48 UTC 2016
EGO-II.1 <eoconnor25 at gmail.com>

On 02/08/2016 07:38 PM, Always Learning wrote:
> On Mon, 2016-02-08 at 14:22 -0800, John R Pierce wrote:
>> the only truly safe way to destroy data on magnetic media is to grind
>> the media up into filings or melt it down in a furnace.
> I unscrew the casing, extract the disk platter(s), slide a very strong
> magnet over both sides of the platter surface then bend the platter in
> half.
> How secure is that ?
> I can't afford a machine that grinds everything into dust particles.
I have seen a guy in the I.T. department where I  work take a hard 
drive....remove as many stickers from it (to make it porous as possible) 
and then soak it in a "brine" of ammonia, hydrogen peroxide, bleach, and 
salted water...for like a week or two. Afterwards? total useless junk.