Adding new hard disk

[Mark]

Ok, I bought a new 80G hard disk, for backups. I added it on the second IDE.
But now, when I ran FDISK and the Label program (booted from CD), it will
not allow me to just add /backup as mount point, and says it wants a root +
swap partition too. :( I did "W" when writing out the info, but still,
/etc/fstab is unchanged.

All I want is to add the new hard disk as mount point /backup. Please, tell
me how to do this.

- Mark