1. メーカー：KEIAN 恵安　,型番：KU350A

製品へのURL：http://www.keian.co.jp/pro_guide/main/Items.asp?DivisionID=22&DivisionName=CASE
参考：http://akiba.ascii24.com/akiba/news/2002/07/27/637553-000.html
2. 4.7-STABLE(cvsupは2002Nov20頃)
3. USB デバイスを認識しているところの /var/log/messages

umass0: Acer Labs USB 2.0 Storage Device, rev 2.00/1.03, addr 2, SCSI over Bulk-Only
umass0:3:0:-1: Attached to scbus3 as device 0
da1 at umass-sim0 bus 0 target 0 lun 0
da1: <USB 2.0 Storage Device 0100> Fixed Direct Access SCSI-0 device
da1: 650KB/s transfers
da1: 76319MB (156301488 512 byte sectors: 64H 32S/T 10783C)

4. %usbdevs -v
Controller /dev/usb0:
addr 1: self powered, config 1, UHCI root hub(0x0000), VIA(0x0000), rev 1.00
port 1 addr 2: self powered, config 1, USB 2.0 Storage Device(0x5621), Acer Labs(0x0402), rev 1.03
port 2 powered

5. 動作した。
mountする前に、sysctl -w kern.cam.da.no_6_byte=1が必要。