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Date: Wed, 19 Apr 2006 01:33:10 +0200
From: Ivan Voras <ivoras@fer.hr>
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To: Vladimir Grebenschikov <vova@sw.ru>
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Cc: current@freebsd.org
Subject: Re: Is there way to make geom volume from pices ?
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Vladimir Grebenschikov wrote:
> Hi
> 
> Idea is simple - to make partition for qemu, I want to use static file
> as MBR, and real partitions as part of bug disk, but some (booted
> freebsd for example) as read-only and some as read-write.

You could try and create devices from files (with mdconfig) and use 
gconcat to concatenate them...