you can not mount a partition directly to " / "
SELinux will stop it
that is a fat ? what ? fat32 partition ?
add a folder to /mnt ( mnt IS the preferred place in fedora )
the /media folder is used for AUTO mounting of dvd's , cd's usb-drives,...
chown ????:users fat.drive
------ note replace ???? with YOUR user name !!! ------
then add to fstab
/dev/sda3 /mnt/fat.drive vfat defaults 1 2
that partition should auto mount and be in the left window on Nautilus
listed a a partition by it's size