Date: Sun, 18 Oct 2009 21:00:04 -0700 From: Julian Elischer <julian@elischer.org> To: Daniel Nebdal <dnebdal@gmail.com> Cc: John Baldwin <john@baldwin.cx>, Antony Mawer <lists@mawer.org>, freebsd-current@freebsd.org, =?ISO-8859-1?Q?Dag-Erling_Sm=F8rgrav?= <des@des.no>, David Ehrmann <ehrmann@gmail.com> Subject: Re: 8.0rc1 not recognizing partitions on EPIA SN Message-ID: <4ADBE444.1010706@elischer.org> In-Reply-To: <f8b073790910180853n2cc8cc72ua1006e015e2b3525@mail.gmail.com> References: <4ACE6D84.3000209@gmail.com> <4ACE833A.3030506@uffner.com> <4ACE9DFD.3010207@gmail.com> <200910131644.04358.john@baldwin.cx> <ea2d4a5b0910170126r78b2afcfib1547722bb3758b8@mail.gmail.com> <86ljja3ud5.fsf@ds4.des.no> <f8b073790910171705p1c5c996atee2c6aa109ec9d15@mail.gmail.com> <20091018162750.E82400@ury.york.ac.uk> <f8b073790910180853n2cc8cc72ua1006e015e2b3525@mail.gmail.com>
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Daniel Nebdal wrote: > On Sun, Oct 18, 2009 at 5:32 PM, Gavin Atkinson > <gavin.atkinson@ury.york.ac.uk> wrote: >> As I understand things, the problems are partially due to a bug in older >> versions of sysinstall that created incorrect disklables in DD mode, and >> partially due to the new GEOM partitioning modules, which now parse these >> ambiguous disk labels differently. >> >> You can get around this by compiling a custom kernel and using the old >> partitioning modules (use GEOM_MBR and GEOM_BSD rather than GEOM_PART), but >> you may well just be postponing the problem as I believe the old modules >> were planned to be removed at some point. >> >> Gavin > > Does that mean that it's possible to write a DD-style disklabel that > GEOM_PART would be happy with? > That would open up the possibility of correcting the old label > in-place (somehow)... it may be as little as overwriting bytes 510 and 511 of block0. (the last 2 bytes of the block are a magic number) this would stop the fdisk taster from recognising it as an fdisk block and teh disklabel taster would recognise the disklabel. if you try this, keep a backup of block0 :-)
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