I installed PCBSD9.1 (Based on FreeBSD9.1) on a 16GB USB stick. The default FS is ZFS with root.
When I installed Webmin the "System Information" displays "Local disk space" as "117.74 GB total, 3.95 GB used".
This is impossible. I think Webmin is calculating all of the ZFS mounts as separate disks or FS's and adding them together.
I also noticed on FreeBSD Webmin does not show Partitions on local disks.