/home and /net are some strange (synthetic) filesystems unto themselves. They represent some sort of networked "autofs" stuff which isn't part of the normal (physical) HFS+.
[i don't know enough to explain it any better.]
/dev is also an oddball. If i attack it directly, it gives me:
sudo du -xhd1 /dev
du: Can't follow symlink cycle from /dev/fd/3 to /dev/fd/3
Last edited by Hal Itosis; 06/24/10 03:22 PM.