Comment 14 for bug 120829

I've been dancing around this problem for the last few releases too. My workaround is to use /mnt instead of /media in fstab and then Gnome will obey the noauto. Ideally, I would still get these noauto partitions listed in Places/Other Removable Media menu so I could choose to mount them with a click, but that feature seemed to go away. gconf-editor apps/nautilus/preferences has
a medianoautomount option which may help your situation.