There is a bug in FreeNAS where the serial numbers don’t always show up in the Web Utility ( FreeNAS utility – not the Highpoint WebGUI ): See Here
To get around this you can run a command to refresh the drive and get the serial number:
# python /usr/local/www/freenasUI/tools/sync_disks.py /dev/da0
In this example da0 is the drive to refresh. You can do this for as many drives as needed. You can also group drives together in this fashion:
# python /usr/local/www/freenasUI/tools/sync_disks.py /dev/da[0123456789]
This will do the first 10 drives named – da0, da1, da2 etc ..
You can also do this:
# python /usr/local/www/freenasUI/tools/sync_disks.py /dev/da1[0123456789]
This will refresh da10, da11, da12 and so on.