-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of EGO-II.1 Sent: den 9 februari 2016 09:00 To: CentOS mailing list Subject: Re: [CentOS] Utility to zero unused blocks on disk
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.
I often find harddrives with several 10 mm drill-holes in them, in the electronics disposal room at work.
I'd say that'd be enough as well. 8-)