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Date: Sat, 28 Dec 2013 21:48:28 +1100
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Subject: Re: (da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
From: Jason Birch <jbirch@jbirch.net>
To: Pol Hallen <freebsdenml@fuckaround.org>
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>
> (da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 00 08 80 00 00 10 00
> (da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
> (da0:umass-sim0:0:0:0): SCSI status: Check Condition
> (da0:umass-sim0:0:0:0): SCSI sense: UNIT ATTENTION asc:28,0 (Not ready to
> ready change, medium may have changed)
> (da0:umass-sim0:0:0:0): Retrying command (per sense data)
> (da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 00 08 80 00 00 10 00
> (da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
> (da0:umass-sim0:0:0:0): SCSI status: Check Condition
> (da0:umass-sim0:0:0:0): SCSI sense: UNIT ATTENTION asc:28,0 (Not ready to
> ready change, medium may have changed)
> (da0:umass-sim0:0:0:0): Retrying command (per sense data)
> g_vfs_done():da0s1[READ(offset=8192, length=8192)]error = 6
>
> and mount point become dead
>

I had a similar situation with an internal drive (Though I don't think I
had the "medium may have changed" message) and it just came down to a loose
cable in my case. Do you have the same issue on other computers or other
USB ports?