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Date: Mon, 18 May 2009 10:51:15 -0700 (PDT)
From: Peter Steele <psteele@maxiscale.com>
To: David Roberts <dtrobert@pacbell.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: umass0: BBB reset failed, TIMEOUT
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>Any ideas? 

I can't offer any solutions but I can tell you that we've seen this exactly problem, and many times. I have a script that copies a tar image into a USB thumb drive and that operation fails frequently. To better guarantee success, I have to boot the system first, and then the copy command works reliably. If I don't do a reboot, I see this same kind of failure, usually as much as 50% of the time. My impression is that USB drive support is simply not that solid.