Date: Sun, 16 Jan 2011 12:59:31 -0600 From: Steve Randall <srandall52@gmail.com> To: Warren Block <wblock@wonkity.com> Cc: freebsd-stable@freebsd.org, quakenet1@optusnet.com.au, perryh@pluto.rain.com, freebsd-usb@freebsd.org Subject: Re: USB Drive not showing up correctly in 8.1 (works in 7.3) Message-ID: <20110116125931.76472050@locust.local> In-Reply-To: <alpine.BSF.2.00.1101161043110.21158@wonkity.com> References: <659F3C99-CA41-4685-B981-115802734D02@optusnet.com.au> <4d329926.9Qq/rSteVFLlBlYm%perryh@pluto.rain.com> <alpine.BSF.2.00.1101161043110.21158@wonkity.com>
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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
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