/var/log/messages

uhci0: <Intel 82371AB/EB (PIIX4) USB controller> port 0x9000-0x901f irq 10 at device 7.2 on pci0
usb0: <Intel 82371AB/EB (PIIX4) USB controller> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
umass0: USB Solid state disk, rev 1.10/1.00, addr 2
..
da0 at umass-sim0 bus 0 target 0 lun 0
da0: <BUFFALO ClipDrive 1.11> Removable Direct Access SCSI-2 device
da0: 650KB/s transfers
da0: 126MB (258048 512 byte sectors: 64H 32S/T 126C)
(da0:umass-sim0:0:0:0): READ(6)/WRITE(6) not supported, increasing minimum_cmd_size to 10.

4. usbdevs -v の結果(これは大変重要です。というのも、製品をユニークに決定できるからです)

#usbdevs -v
Controller /dev/usb0:
addr 1: self powered, config 1, UHCI root hub(0x0000), Intel(0x0000), rev 1.00
 port 1 addr 2: power 40 mA, config 1, ThumbDrive(0x1111), Trek Technology(0x0a16), rev 1.00
 port 2 addr 3: power 100 mA, config 1, Solid state disk(0x6803), USB(0x0ea0), rev 1.00

※port 2だけ参照くださいまし。