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Date: Fri, 4 Aug 2006 02:00:01 -0400
From: "Michael R. Wayne" <freebsd@wayne47.com>
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Subject: Re: fdisk problem on 3ware based system (6.1-RELEASE-p3)
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On Thu, Aug 03, 2006 at 10:29:08AM +0200, Stefan Bethke wrote:
> Am 03.08.2006 um 07:50 schrieb Michael R. Wayne:
> 
> >But, I am unable to create a third partition.  Every time I do  
> >that, I get:
> >   ERROR: Unable to write data to disk twed0!
> 
> Are there any mounted filesystems in those two first slices? Then  
> geom won't allow you to modify the partition table. You need to boot  
> off a CD, or set a sysctl to allow writing anyway (see geom(4)).

Thank you!  Setting
   sysctl kern.geom.debugflags=0x10
permitted me to do the work with fdisk.

I tried to use sysinstall but it appears to only modify the in-core
structure but not to update the disk.

Perhaps sysinstall needs a few tweaks?

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