From owner-freebsd-hackers@FreeBSD.ORG  Tue Jul  8 17:01:54 2003
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Date: Tue, 8 Jul 2003 19:59:39 -0400
From: Eric Jacobs <eaja@erols.com>
To: freebsd-hackers@freebsd.org, jennifer@tevn.com
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Subject: Re: mount USB storage device
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On Wed, 9 Jul 2003 09:28:54 +1000
"Jennifer" <jennifer@tevn.com> wrote:

> 
> But the console shows:
> 
> da0:( umass-sim0:0:0:0):READ(06),cbd:800010
> da0:( umass-sim0:0:0:0):ILLEGAL REQUEST ASC:20,0
> da0:( umass-sim0:0:0:0):Invalid command operation code
> da0:reading primary partition table:error reading fsbn0
> msdos: /dev/da0s1: input/output error

READ_6 and WRITE_6 are not supported by a good number of these
types of devices. You'll either need to upgrade to a version
of the kernel that has the cmd6workaround functionality
in sys/cam/scsi/scsi_da.c (I believe this is in 4.7-RELEASE and
newer), or else add the DA_Q_NO_6_BYTE quirk for your device
into the quirk entries in that file manually.

Eric