Can't unmount USB drive

[Mike Harding]

It is listed in /etc/fstab, but as mounting to /wd with 'noauto'.
When it gets automounted, it gets mounted to /media/wdpassport.

When I try to unmount it I see 'volume is safe to remove' but then it
gets remounted immediately.

Where can I find docs about what you say below?

   You can merge storage.automount_enabled_hint=3Dtrue into the volume
   properties by creating an fdi file
   under /usr/local/share/hal/fdi/preprobe/20thirdparty.  This assumes, of
   course, that hal is the one mounting the volume.  If the volume is
   listed in fstab, then it's being mounted traditionally.  If it's being
   immediately remounted after mounting, that sounds like a bug to me.

   Joe