From owner-freebsd-usb@FreeBSD.ORG  Sun Jan 23 16:48:18 2011
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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Sun, 23 Jan 2011 17:48:24 +0100
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Cc: mav@freebsd.org
Subject: Re: da(4) not attaching to USB drive
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On Sunday 23 January 2011 10:06:00 Hans Petter Selasky wrote:
> Hi Mav,
> 
> Do you know if there are any recent changes in the SCSI layer on FreeBSD
> that will affect USB SCSI devices?

Another idea:

Maybe your device is too late identifying itself. You could try:

usbconfig -d X.Y set_config 0

Then:

usbconfig -d X.Y set_config 1

After that the device has been plugged.

--HPS