Date: Fri, 29 Oct 2010 12:00:17 +0100 From: Bruce Cran <bruce@cran.org.uk> To: Garrett Cooper <gcooper@FreeBSD.org> Cc: Doug Barton <dougb@freebsd.org>, d@delphij.net, Ulrich =?ISO-8859-1?Q?Sp=F6rlein?= <uqs@spoerlein.net>, Gary Jennejohn <gljennjohn@googlemail.com>, src-committers@freebsd.org, Robert Watson <rwatson@freebsd.org>, Bruce Evans <brde@optusnet.com.au>, svn-src-head@freebsd.org, Alexander Best <arundel@freebsd.org>, svn-src-all@freebsd.org, Dag-Erling Smorgrav <des@freebsd.org> Subject: Re: svn commit: r214431 - head/bin/rm Message-ID: <20101029120017.00003c98@unknown> In-Reply-To: <AANLkTimBMJK2knB7_9Ssbg44xk_Fd7fEfo9phkhhGX8D@mail.gmail.com> References: <20101027212601.GA78062@freebsd.org> <4CC899C3.7040107@FreeBSD.org> <20101027214822.GA82697@freebsd.org> <4CC8A89D.5070909@delphij.net> <20101028152418.A916@besplex.bde.org> <20101028095538.24147119@ernst.jennejohn.org> <alpine.BSF.2.00.1010281845030.58253@fledge.watson.org> <20101028182219.GA36559@freebsd.org> <alpine.BSF.2.00.1010282006510.84180@fledge.watson.org> <AANLkTi=-QEDFzis0L15mnSgFVaJkmy%2Bc3MyEsXZSsArf@mail.gmail.com> <20101028204849.GE46314@acme.spoerlein.net> <AANLkTimBMJK2knB7_9Ssbg44xk_Fd7fEfo9phkhhGX8D@mail.gmail.com>
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On Thu, 28 Oct 2010 14:11:14 -0700 Garrett Cooper <gcooper@FreeBSD.org> wrote: > Unfortunately it's implied superficially by the 3 pass tort; but as > most people who understand magnetic disks know, unless you completely > obliterate a disk, wipe over it with random data enough times, > whatever, the content is still on the disk and retrievable via various > methods... I agree that this advice should be placed near the flag > itself so that people completely understand the implications of the > feature. I believe the only method 10-15 years ago would have been a scanning electron microscope, but that probably isn't possible with today's disks. Simply writing zeros once is enough to obliterate all the data (except for any remapped sectors). -- Bruce Cran
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