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Subject: Re: I'm experiencing g_vfs_done() error = 5 with more than one
 USB/HDD storage device on 11-STABLE when heavy writing.
To: Jakub Lach <jakub_lach@mailplus.pl>, freebsd-usb@freebsd.org
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From: Hans Petter Selasky <hps@selasky.org>
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Date: Thu, 16 Feb 2017 22:44:45 +0100
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On 02/10/17 10:12, Jakub Lach wrote:
> Adding back "options         USB_DEBUG       # enable debug msgs"
> to my STRIPPED config (as I had it commented out lately) was what
> restored the behaviour to GENERIC (working one) (sic!).
> Finishing now 4th? dump.
>
> http://pastebin.ca/3766145
>

Does it make any difference with usbtest ?

It might be a timing issue in the USB firmware in your USB HDD.

--HPS