Date: Fri, 14 Jul 2017 00:38:30 -0700 From: Doug Hardie <bc979@lafn.org> To: Arthur Chance <freebsd@qeng-ho.org> Cc: David Christensen <dpchrist@holgerdanske.com>, "freebsd-questions@freebsd.org Questions" <freebsd-questions@freebsd.org> Subject: Re: Unusual Question Message-ID: <36DB0C7C-FF64-4BFA-9D7E-CF2A616FF534@mail.sermon-archive.info> In-Reply-To: <0ccfaae9-6fdb-adfa-71b2-5dd3978f41b3@qeng-ho.org> References: <888578F8-AD68-4993-823C-152789F3C929@mail.sermon-archive.info> <b5b8a49e-804d-15be-25b7-ff7c29a5ae8a@holgerdanske.com> <B63B13F0-D5E4-4C32-AD9B-B9D505AFDAA2@mail.sermon-archive.info> <0ccfaae9-6fdb-adfa-71b2-5dd3978f41b3@qeng-ho.org>
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> On 14 July 2017, at 00:26, Arthur Chance <freebsd@qeng-ho.org> wrote: >=20 > On 14/07/2017 07:11, Doug Hardie wrote: >>=20 >>> On 13 July 2017, at 21:44, David Christensen = <dpchrist@holgerdanske.com> wrote: >>>=20 >>> On 07/09/17 02:57, Doug Hardie wrote: >>>> I have a FreeBSD 9.3 remote server that needs to be purged. I know = that rm -rf / will remove all the directory entries, but I need to write = over the drive. I thought that dd if=3D/dev/zero of=3D/dev/ada0 might = do the trick, but it gives an not permitted error. The whole thing can = crash and burn at the end. This is an unmanned site so moving drives is = not viable. >>>=20 >>> If the machine has BIOS and the system drive isn't too large, write = an assembly program that fits into the MBR bootstrap code area to wipe = the rest of the drive, assemble the program, write it into the MBR, and = reboot. >>>=20 >>>=20 >>> Bonus: the program deletes the MBR when done wiping the rest of the = drive. >>=20 >> Neat idea, but I have a number of these systems and they all use = different disk drives. That would be a lot of work writing drivers for = each type. >=20 > How about using the BIOS extended write sector call (INT 13h, AH=3D43h) = in > your code? That should be portable. I have no experience with the BIOS so that sounds reasonable, but I = couldn't say for sure. Even so, that would be a bunch of work to figure = all that out. Great project for someone with time available.
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