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Date: Sun, 03 Apr 2005 23:07:16 -0600 (MDT)
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To: ache@nagual.pp.ru
From: "M. Warner Losh" <imp@bsdimp.com>
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cc: current@freebsd.org
Subject: Re: Can't change partition table anymore
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In message: <20050404044028.GC49953@nagual.pp.ru>
            Andrey Chernov <ache@nagual.pp.ru> writes:
: On Sun, Apr 03, 2005 at 10:21:54PM -0600, M. Warner Losh wrote:
: > I don't see these problems on my disks.  Maybe your partitions
: > overloap the MBR?
: 
: They are surely not (two of four partitions are ever unused).
: 
: As Daniel O'Connor wrote:
: "If you have part of that device open GEOM won't let you touch the MBR.."
: Even in single user. Mounted as / disk always have some part open...

Daniel is wrong.  If you have a device open that overlaps the MBR,
then geom will enforce this restriction.  If you don't, then it simply
will not, as I've shown in other mail.

Warner