From owner-freebsd-questions@FreeBSD.ORG Mon Oct 11 07:43:37 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2AC0D16A4CF for ; Mon, 11 Oct 2004 07:43:37 +0000 (GMT) Received: from mail.gmx.net (mail.gmx.de [213.165.64.20]) by mx1.FreeBSD.org (Postfix) with SMTP id 1098D43D5C for ; Mon, 11 Oct 2004 07:43:36 +0000 (GMT) (envelope-from Emanuel.Strobl@gmx.net) Received: (qmail 15537 invoked by uid 65534); 11 Oct 2004 07:43:34 -0000 Received: from flb.schmalzbauer.de (EHLO cale.flintsbach.schmalzbauer.de) (62.245.232.135) by mail.gmx.net (mp003) with SMTP; 11 Oct 2004 09:43:34 +0200 X-Authenticated: #301138 From: Emanuel Strobl To: freebsd-questions@freebsd.org Date: Mon, 11 Oct 2004 09:43:16 +0200 User-Agent: KMail/1.7 References: <200410110237.i9B2bOn12053@clunix.cl.msu.edu> In-Reply-To: <200410110237.i9B2bOn12053@clunix.cl.msu.edu> X-OS: FreeBSD X-Birthday: 10/06/72 X-Address: Munich, 80686 X-Tel: +49 89 18947781 X-CelPhone: +49 173 9967781 X-Country: Germany MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1145114.7ybFrGshYu"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <200410110943.32304.Emanuel.Strobl@gmx.net> cc: Jerry McAllister Subject: Re: MBR not overwritable with dd? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Oct 2004 07:43:37 -0000 --nextPart1145114.7ybFrGshYu Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Am Montag, 11. Oktober 2004 04:37 schrieb Jerry McAllister: > > I tried to null out the MBR with the BETA7 fixit CD with the follwoing= =3D20 > > command: > > dd if=3D3D/dev/zero of=3D3D/dev/ad0 count=3D3D16 > > > > After that fdsik still showed me a valid partition tabel! > > How? Does GEOM map the beginning of the raw device? > > Was it getting it from the in-memory informatino? After a lowlevel format fdisk still showed me a partition in slice 1 with i= d=20 165. So fdisk is misbehaving here. A hexdump of the first 512 Bytes validat= ed=20 that fdisk is wrong. Another question is why does sysinstall complain about wrong geometry? It=20 claims the CHS values, but why? I heard that it's the fault of "other OSes"= =20 becaus they're writing wrong info onto the disk. But this disk has nothing= =20 but NULLs on it and sysinstall is presenting CHS values, also fdisk reads C= HS=20 Values "from in-core labels". Can anybody entlighten me what in-core labels= =20 are? Then there's another error in sysinstall but I'll post that on current (whe= n=20 creating two slices, the partition table ends up in having two active=20 entries) Thanks, =2DHarry > > ////jerry > > > Thank you in advance, > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" --nextPart1145114.7ybFrGshYu Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQBBajmkBylq0S4AzzwRAppVAJ9kUiSQ52gDSFcqMh3C1yO6Dt9qiQCfUV8X EKoNwtTM4DmuQj5n2um5GP4= =wlx1 -----END PGP SIGNATURE----- --nextPart1145114.7ybFrGshYu--