[CentOS] Utility to zero unused blocks on disk

On 02/08/2016 06:38 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 a sledge hammer. It's good exercise and fun.

-- 
-- Steve