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Date: Sun, 16 Jan 2011 11:00:01 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: perryh@pluto.rain.com
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Cc: quakenet1@optusnet.com.au, 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 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.