From owner-freebsd-hackers@FreeBSD.ORG  Fri May  8 11:54:19 2009
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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Fri, 8 May 2009 12:56:46 +0200
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Subject: Re: undetected umass device
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On Friday 08 May 2009, Danny Braniss wrote:
> Hi,
> this is a:
>     USB to Parallel-ATA bridge(0x0c05), Sunplus Technology Inc.(0x04fc)
> or in english, a nifty dongle  that can be connected to ata/sata disk, but
> umass fails to detected it fully, and detaches it.
>
> any hints? quircks?
> thanks,
> 	danny
>

Can you get dmesg and the USB descriptors of your device?

--HPS