On Apr 30, 2014, at 11:13 AM, Ian Lepore <i...@freebsd.org> wrote: > On Wed, 2014-04-30 at 17:22 +0100, Steven Hartland wrote: >> ----- Original Message ----- >> From: "Ian Lepore" <i...@freebsd.org> >> To: "Eitan Adler" <ead...@freebsd.org> >> Cc: <src-committ...@freebsd.org>; <svn-src-...@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 >> >> >>> 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 >>>> >>>> Log: >>>> Add a /dev/full device. >>>> >>>> /dev/full is similar to /dev/zero except it always returns >>>> ENOSPC when you attempt to write to it. >>>> >>> >>> 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. >> >> Surely for that you want camcontrol security ...? >> >> Regards >> Steve > > 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. > > 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. > > 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 ‘secure’ in it really is a ‘erase all contents of this drive and reinitialize to factory defaults’. Warner _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
