In Linux Mint Debian 64 bit The installer was't capable of making a working entry in FSTAB to automount an fat partition on startup. To solve this edit Fstab from a terminal:
gksu gedit /etc/fstab
In FSTAB add:
UUID=8385-8482 /media/grub2 vfat users,gid=users,umask=0002,utf8 0 0
in users and groups (gebruikers en groepen) in the main menu add all users to the group user
in terminal give the command:
sudo mkdir /media/grub2
sudo mount -a
And the fat16 of fat32 drive will be mounted on startup.
Note: change the UUID to the UUID of your fat partition. You can check the UUID from within GParted. Change the directoryname to whatever you want it to be, but do that the same way in Fstab and in /media
It's strange that this should be done this way. In Ubuntu 10.10 32bit it was enough to have this line in fstab:
UUID=8385-8482 /media/grub2 vfat utf8,umask=007,gid=46 0 1
as the installer of ubuntu does. The reason for that: I don't know.