Created attachment 155104 [details]
patch for usb_quirk.c, usbdevs

original 11-current system is 
FreeBSD 11.0-CURRENT (VENUS) #0 r280370: Mon Mar 23 22:14:14 CET 2015

relevant dmesg entries when inserting the drive:

umass0: <Verbatim STORE N GO, class 0/0, rev 2.10/1.00, addr 2> on usbus2
umass0:  SCSI over Bulk-Only; quirks = 0x8100
umass0:4:0: Attached to scbus4
(probe0:umass-sim0:0:0:0): REPORT LUNS. CDB: a0 00 00 00 00 00 00 00 00 10
00 00 
(probe0:umass-sim0:0:0:0): CAM status: Auto-Sense Retrieval Failed
(probe0:umass-sim0:0:0:0): Error 5, Unretryable error
(da0:umass-sim0:0:0:0): got CAM status 0x50
(da0:umass-sim0:0:0:0): fatal error, failed to attach to device

=========

after applying the attached patch, the device becomes usable as /dev/da0,
the successful quirk being
 USB_QUIRK(VERBATIM, STORENGO, 0x0000, 0xffff, UQ_MSC_IGNORE_RESIDUE)


ugen2.2: <Verbatim> at usbus2
umass0: <Verbatim STORE N GO, class 0/0, rev 2.10/1.00, addr 2> on usbus2
umass0:  SCSI over Bulk-Only; quirks = 0x8180
umass0:4:0: Attached to scbus4
Trying to mount root from ufs:/dev/ada0p2 [rw]...
(probe0:umass-sim0:0:0:0): REPORT LUNS. CDB: a0 00 00 00 00 00 00 00 00 10 00 00 
(probe0:umass-sim0:0:0:0): CAM status: SCSI Status Error
(probe0:umass-sim0:0:0:0): SCSI status: Check Condition
(probe0:umass-sim0:0:0:0): SCSI sense: ILLEGAL REQUEST asc:20,0 (Invalid command operation code)
(probe0:umass-sim0:0:0:0): Error 22, Unretryable error
da0 at umass-sim0 bus 0 scbus4 target 0 lun 0
da0: <Verbatim STORE N GO > Removable Direct Access SPC-4 SCSI device
da0: 40.000MB/s transfers
da0: 14909MB (30535401 512 byte sectors: 255H 63S/T 1900C)
da0: quirks=0x2<NO_6_BYTE>
uhid0: <Fujitsu Siemens Computers Fujitsu Siemens Computers USB-Keyboard rf v1.0, class 0/0, rev 1.10/0.01, addr 2> on usbus4