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From: Jerahmy Pocott <quakenet1@optusnet.com.au>
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Date: Mon, 17 Jan 2011 07:29:35 +1100
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To: Steve Randall <srandall52@gmail.com>
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Cc: Warren Block <wblock@wonkity.com>, perryh@pluto.rain.com,
	freebsd-stable@freebsd.org, freebsd-usb@freebsd.org
Subject: Re: USB Drive not showing up correctly in 8.1 (works in 7.3)
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On 17/01/2011, at 5:59 AM, Steve Randall wrote:

> On Sun, 16 Jan 2011 11:00:01 -0700 (MST)
> Warren Block <wblock@wonkity.com> wrote:
> 
>> On Sat, 15 Jan 2011, perryh@pluto.rain.com wrote:
>> 
>>> Jerahmy Pocott <quakenet1@optusnet.com.au> wrote:
>>> 
>>>> I have a USB Drive that was working fine under 7.3, but since
>>>> updating to 8.1 no longer has the correct /dev entries. Under
>>>> 7.3 it was da0s1, in 8.1 there is now only da0 and da0a, which
>>>> shouldn't exist...
>> 
>> da0s1 is MBR, da0a is "dangerously dedicated".  I would not expect 
>> differences between 7 and 8 USB to show that on an existing drive.  If 
>> the drive was reworked during the 7-to-8 upgrade--maybe with "bsdlabel 
>> auto"--that would be a more likely explanation.
> 
> The actual explanation is the new geom partitioners introduced in 8.0.
> 
> The disk has an MBR in block 0 and a forgotten BSD label (dangerously
> dedicated) in block 1. 8.x sensibly ignores one of them; unfortunately
> it ignores the MBR, not the unwanted BSD label.
> 
> The solution is:
> 
> # dd if=/dev/zero of=/dev/da0 seek=1 count=1

Thank you, this does indeed correct the issue.