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Date:      Wed, 11 Aug 1999 18:00:48 +0100
From:      Josef Karthauser <joe@pavilion.net>
To:        Dag-Erling Smorgrav <des@flood.ping.uio.no>
Cc:        hackers@FreeBSD.ORG, fs@FreeBSD.ORG
Subject:   Re: Disk label recovery - request for suggestions.
Message-ID:  <19990811180048.Z88035@pavilion.net>
In-Reply-To: <xzpyafitgck.fsf@flood.ping.uio.no>; from Dag-Erling Smorgrav on Wed, Aug 11, 1999 at 06:46:51PM %2B0200
References:  <19990808185112.A99557@pavilion.net> <xzpg11qv3nm.fsf@flood.ping.uio.no> <19990811171514.X88035@pavilion.net> <xzp672muw03.fsf@flood.ping.uio.no> <19990811173535.Y88035@pavilion.net> <xzpyafitgck.fsf@flood.ping.uio.no>

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On Wed, Aug 11, 1999 at 06:46:51PM +0200, Dag-Erling Smorgrav wrote:
> Josef Karthauser <joe@pavilion.net> writes:
> > On Wed, Aug 11, 1999 at 06:23:24PM +0200, Dag-Erling Smorgrav wrote:
> > > Josef Karthauser <joe@pavilion.net> writes:
> > > > Ahha - of course.  Ok, let me re-phrase the question then.  By looking
> > > > at the contents of the superblocks on a UFS file system it's possible to
> > > > reconstruct a disklabel for a slice.
> > > Well, it's possible to reconstruct the label information for *that
> > > particular UFS file system*, since if you know the location of the
> > > superblock (or one of its backup copies), you can determine the offset
> > > and size of the FS. It won't tell you anything about *other*
> > > partitions though.
> > That's ok, because each slice has its _own_ label.  If the bios partition
> > table loses it's mind that's a little more work :).
> 
> You're confusing partitions and slices.

I don't think so - PC's have a partition table.  Us FreeBSDers call these
partitions 'slices', and subdivide these into FreeBSD partitions.  Each
slice (pc partition) has a disklabel which denotes where the FreeBSD partitions
live on the slice.

I see what you were saying now above now.  I agree that the superblock for
a UFS file system won't tell anything about other UFS partitions, but
a block by block search of the whole slice will identify potential
superblocks that will.

Joe
-- 
Josef Karthauser	FreeBSD: How many times have you booted today?
Technical Manager	Viagra for your server (http://www.uk.freebsd.org)
Pavilion Internet plc.  [joe@pavilion.net, joe@uk.freebsd.org, joe@tao.org.uk]


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