Date: Mon, 11 Oct 2004 09:43:16 +0200 From: Emanuel Strobl <Emanuel.Strobl@gmx.net> To: freebsd-questions@freebsd.org Cc: Jerry McAllister <jerrymc@clunix.cl.msu.edu> Subject: Re: MBR not overwritable with dd? Message-ID: <200410110943.32304.Emanuel.Strobl@gmx.net> In-Reply-To: <200410110237.i9B2bOn12053@clunix.cl.msu.edu> References: <200410110237.i9B2bOn12053@clunix.cl.msu.edu>
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--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--
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