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Date: Wed, 07 Sep 2005 20:57:28 +0200
From: =?ISO-8859-1?Q?Bj=F6rn_K=F6nig?= <bkoenig@cs.tu-berlin.de>
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To: Frank Bonnet <f.bonnet@esiee.fr>
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Cc: freebsd-questions@freebsd.org
Subject: Re: FDISK cannot write
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Frank Bonnet wrote:

> I'm trying to add a partition to an existing disk at 5.4-R
> on a HP XW 4200 (SATA)
> 
> FDSIK fail with an error message "cannot write ..."
> 
> The "bizarre" thing is I have installed this machine
> from CDROM and partitionning the disk was OK ...

Set kern.geom.debugflags=16 with sysctl to allow writing the MBR 
temporarily.

Björn