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Date: Thu, 15 Jan 2009 16:42:52 -0600 (CST)
From: Wes Morgan <morganw@chemikals.org>
To: Marcel Moolenaar <xcllnt@mac.com>
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Cc: current@freebsd.org
Subject: Re: GEOM and moving to CURRENT from 7.1
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On Thu, 15 Jan 2009, Marcel Moolenaar wrote:

>
> On Jan 15, 2009, at 11:46 AM, Dimitry Andric wrote:
>
>> On 2009-01-15 20:35, Marcel Moolenaar wrote:
>>> You need a boot sector for the BIOS to jump into, but
>>> it doesn't have to be a MBR with slices. That's why
>>> a DD has something that looks an awful lot like a MBR
>>> in the first sector. It could very well be boot sector
>>> of an FAT* file system.
>> 
>> I can confirm, that wiping out the partition table (but not the boot
>> code), using "bsdlabel -B /dev/ad0s1", makes "s1" disappear.  Subsequent
>> boots can then be done from /dev/ad0a, and this works both for "old"
>> kernels, e.g. from before r186240 and after.
>
> Thanks *very* much for testing! It's important that we
> get the details right, so that we can consider adding
> code to help in the migration and fix whatever is broken.

How did so many people (myself included) end up with invalid disk labels? 
Sysinstall?