What file resets fstab on persistent live environments?

For my LiveUSB install with Ubuntu 11.10 (which has a casper-rw persistence loopback file), the file that worked for me to have drives mounted automatically is:

/usr/share/initramfs-tools/scripts/casper-bottom/12fstab

I added lines into that script which worked to add new drive mounts upon boot-up. The odd thing is that my /etc/fstab file does NOT reflect the drive mounts. This would seem to suggest that the /etc/fstab file is just a dummy file or something to the LiveCD setups. Not sure, but changes added to the 12fstab file DO persist.

Add your mount commands in /etc/rc.local

...
mount -t ntfs-3g -L Inter /media/Inter -o uid=1000,gid=999,umask=002
exit