Can't unmount USB drive

[Mike Harding]

I got one of those nifty USB WD drives (with a space in the label
name, yet) and with the latest gnome, it gets auto-mounted if I plug
it in, which is fine.  However, if I 'umount' it or try to unmount it
with the disk mounter applet or the desktop, it gets immediately
remounted.  Any way to stop this?  Right now I have to quit Gnome to
remove the disk.  Can I at least disable the auto-mount?

- Mike H.