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From: John Baldwin <jhb@freebsd.org>
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Date: Mon, 26 Mar 2012 10:17:41 -0400
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	(bigwig.baldwin.cx); Mon, 26 Mar 2012 10:48:09 -0400 (EDT)
Cc: rank1seeker@gmail.com, hackers@freebsd.org
Subject: Re: BUG: REL 9.0 - 'boot0cfg' fails with providers of non 512 byte
	sectorsize
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On Sunday, March 25, 2012 11:05:06 am rank1seeker@gmail.com wrote:
> I've created a vnode image (md0) with sectorsizes of 8192 and 4096
> 
> After installing MBR's bootcode '/boot/boot0', in provider 'md0' I did:
> # boot0cfg -o noupdate -m 0xc md0
> boot0cfg: read /dev/md0: Invalid argument
> # boot0cfg -v md0
> boot0cfg: read /dev/md0: Invalid argument
> 
> If custom sectorsize isn't specifed(512 bytes), then both above CMDs will 
work.

MBR bootstraps (such as boot0) assume a 512 byte sector.  They won't boot 
correctly on media with a different sector size.  So even if you "fixed" 
boot0cfg, you wouldn't have a bootable system.

-- 
John Baldwin