root@mxprox:~# lshw -class disk -class storage
  *-usb
       description: Mass storage device
       product: My Passport 0748
       vendor: Western Digital
       physical id: 2
       bus info: usb@6:2
       logical name: scsi8
       version: 10.19
       serial: 575841314139325636393231
       capabilities: usb-3.00 scsi emulated scsi-host
       configuration: driver=usb-storage maxpower=896mA speed=5000Mbit/s
     *-disk
          description: SCSI Disk
          product: My Passport 0748
          vendor: WD
          physical id: 0.0.0
          bus info: scsi@8:0.0.0
          logical name: /dev/sdc
          version: 1019
          serial: WXA1A92V6921
          size: 1862GiB (2TB)
          capabilities: partitioned partitioned:dos
          configuration: ansiversion=6 logicalsectorsize=512 sectorsize=512 signature=0005f107

root@mxprox:~# ls -l /dev/disk/by-id | grep WXA1A92V692
root@mxprox:~#

root@mxprox:~# ls -l /dev/disk/by-id | grep 75841314139325
lrwxrwxrwx 1 root root  9 Feb 18 17:21 usb-WD_My_Passport_0748_575841314139325636393231-0:0 -> ../../sdc
lrwxrwxrwx 1 root root 10 Feb 18 17:21 usb-WD_My_Passport_0748_575841314139325636393231-0:0-part1 -> ../../sdc1

root@mxprox:~# qm set 105 -scsi2 usb-WD_My_Passport_0748_575841314139325636393231-0:0-part1
storage 'usb-WD_My_Passport_0748_575841314139325636393231-0' does not exist
root@mxprox:~# qm set 105 -scsi2 usb-WD_My_Passport_0748_575841314139325636393231-0:0
storage 'usb-WD_My_Passport_0748_575841314139325636393231-0' does not exist