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Date: Mon, 29 Jan 2007 09:31:15 -0600
From: "Rick C. Petty" <rick-freebsd@kiwi-computer.com>
To: "R. B. Riddick" <arne_woerner@yahoo.com>
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Cc: Hansa <mythtv@logic-q.nl>, freebsd geom <freebsd-geom@FreeBSD.ORG>
Subject: Re: How do I gmirror slices?
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On Mon, Jan 29, 2007 at 06:48:29AM -0800, R. B. Riddick wrote:
> >
> Hmm... I dont think so... There is the first sector of the disk, that is read
> by the BIOS, then there are 8KB somewhere at a fixed position outside the file
> system... And I think those 8KB are already able to understand/read UFS... :-)

It's not really outside the file system, it appears at the beginning of the
file system.  It's 8KB for UFS1 and 64KB for UFS2.  Not only that, but that
8K or 64K chunk is open/unused at the front of every superblock, that is:
for every cylinder group, IIRC.

-- Rick C. Petty