USB 3.0 HDD ILLEGAL REQUEST asc:20, 0 (Invalid command operation code)

[Janaka Withana]

I am using FreeBSD 9.1 to p4 (Nas4Free 9.1.0.1.804) and get the following 
repeated errors using a USB 3.0 hard drive via a USB 3.0 port

Jul 26 17:11:26     nas     kernel: (da1:umass-sim1:1:0:0): SYNCHRONIZE 
CACHE(10). CDB: 35 0 0 0 0 0 0 0 0 0
Jul 26 17:11:26     nas     kernel: (da1:umass-sim1:1:0:0): CAM status: SCSI 
Status Error
Jul 26 17:11:26     nas     kernel: (da1:umass-sim1:1:0:0): SCSI status: 
Check Condition
Jul 26 17:11:26     nas     kernel: (da1:umass-sim1:1:0:0): SCSI sense: 
ILLEGAL REQUEST asc:20,0 (Invalid command operation code)
Jul 26 17:11:26     nas     kernel: (da1:umass-sim1:1:0:0): Error 22, 
Unretryable error

Drive is zfs formatted and seems to work without losing data. This issues 
seems to keep popping up:
http://lists.freebsd.org/pipermail/freebsd-usb/2013-January/011850.html
http://lists.freebsd.org/pipermail/freebsd-usb/2012-April/011179.html

Seems the last author proposed a fixL