How do I keep Fedora 9 from automounting all of my hard drive partitions?

[Dan Hensley]

I am using /dev/sda as my primary hard drive.  I have another hard
drive, /dev/sdb that I use as a backup.  When I log in to a Gnome
desktop (haven't tried anything else yet), all of my /dev/sdb partitions
are auto-mounted.  How do I keep this from happening?  They don't appear
in /etc/fstab, and they aren't mounted if I boot into runlevel 3 for
example.  I cannot find any settings anywhere to control this, and I
don't know exactly what process is responsible.

Dan