Ubuntu :: Trying To Add RAM Disk But Fstab Fails To Boot

I was able to successfully create a small, fixed-size "ram disk" just for kicks, via:

Code:
sudo mkfs -t ext3 -q /dev/ram1 65536
sudo mkdir -p /media/ramdisk
sudo mount /dev/ram1 /media/ramdisk -o defaults,rw
However, I wanted it to auto-boot, so I added the line to fstab:

Code:
/dev/ram1 /media/ramdisk ext3 defaults 0 0

This, however, rendered Ubuntu unbootable and I had to repair the fstab by removing the line via a Live CD. I had enough patience to boot through the CD an extra time to see if just deleting "ext3" would work, but it did not. What would cause this to make the system unbootable and how I could make it work?