Date: Wed, 30 Apr 2014 13:54:09 -0600 From: Warner Losh <imp@bsdimp.com> To: Ian Lepore <ian@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, Eitan Adler <eadler@FreeBSD.org>, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org, Steven Hartland <killing@multiplay.co.uk> Subject: Re: svn commit: r265132 - in head: share/man/man4 sys/dev/null Message-ID: <AFD844FA-66D7-46BC-B90C-1747EECCEB6E@gmail.com> In-Reply-To: <1398878008.22079.67.camel@revolution.hippie.lan> References: <201404300620.s3U6Kmn6074492@svn.freebsd.org> <1398869319.22079.54.camel@revolution.hippie.lan> <CF3018FC8A9641CE811D5F2211298F7D@multiplay.co.uk> <1398878008.22079.67.camel@revolution.hippie.lan>
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On Apr 30, 2014, at 11:13 AM, Ian Lepore <ian@FreeBSD.org> wrote: > On Wed, 2014-04-30 at 17:22 +0100, Steven Hartland wrote: >> ----- Original Message -----=20 >> From: "Ian Lepore" <ian@FreeBSD.org> >> To: "Eitan Adler" <eadler@FreeBSD.org> >> Cc: <src-committers@FreeBSD.org>; <svn-src-all@FreeBSD.org>; = <svn-src-head@FreeBSD.org> >> Sent: Wednesday, April 30, 2014 3:48 PM >> Subject: Re: svn commit: r265132 - in head: share/man/man4 = sys/dev/null >>=20 >>=20 >>> On Wed, 2014-04-30 at 06:20 +0000, Eitan Adler wrote: >>>> Author: eadler >>>> Date: Wed Apr 30 06:20:48 2014 >>>> New Revision: 265132 >>>> URL: http://svnweb.freebsd.org/changeset/base/265132 >>>>=20 >>>> Log: >>>> Add a /dev/full device. >>>>=20 >>>> /dev/full is similar to /dev/zero except it always returns >>>> ENOSPC when you attempt to write to it. >>>>=20 >>>=20 >>> For some reason this reminded me of something I've been wanting for = a >>> while but never get around to writing... /dev/ones, it's just >>> like /dev/zero except it returns 0xff bytes. Useful for dd'ing to = wipe >>> out flash-based media. >>=20 >> Surely for that you want camcontrol security ...? >>=20 >> Regards >> Steve >=20 > I have no idea what that is, but given that it has "security" in the > name, it's almost certainly NOT what I want in any way shape or form. > Shocking as it may be, some people are just not obsessed with = security, > for good reason. It just isn't a consideration in any way in my day = to > day activities. =20 >=20 > When I want to make an sdcard, or some portion thereof, look > empty/virgin/new-from-factory for testing on an embedded system, that > has nothing to do with security, and everything to do with just = exactly > what I asked for: something that writes all-ones-bits. >=20 > Besides, cam and sdcards don't play in the same sandboxes. You likely want some variation of the SATA secure erase command, which = despite having the name =91secure=92 in it really is a =91erase all = contents of this drive and reinitialize to factory defaults=92. Warner=
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