OH NO! Says root partition / is full but it's not! I don't get it

[rtsit]

Why does it say my main root partition is full when it's not? It's only using 146 Meg out of a possible 507 Meg


Filesystem                                   1024-blocks     Used     Avail Capacity  Mounted on
/dev/ad4s1a                                       507630   495736    -28716   106%    /
devfs                                                  1        1         0   100%    /dev
/dev/ad4s1e                                       507630       22    466998     0%    /tmp
/dev/ad4s1f                                    231510140 42142584 170846746    20%    /usr
/dev/ad4s1d                                      2004302   117636   1726322     6%    /var
# du -hxd1 / 
2.0K    /.snap
512B    /dev
2.0K    /tmp
2.0K    /usr
2.0K    /var
4.3M    /etc
2.0K    /cdrom
2.0K    /dist
990K    /bin
127M    /boot
5.9M    /lib
342K    /libexec
2.0K    /media
2.0K    /mnt
2.0K    /proc
3.7M    /rescue
 40K    /root
3.9M    /sbin
2.0K    /command
2.0K    /service
146M    /