To move Debian from a HardDisk partition to other one.
mount /dev/hdg5 /mnt; mount /dev/hdg2 /mnt/boot/ .... and so on
tar cvf - / | (cd ''mnt''; tar xvf -)
And then modify Grub config files in order to boot from your new hdg drive. And execute install-grub
For LILO, execute lilo to save the changes in the MBR of your new /dev/hdg drive
If you had a Swap partition, be sure of having one now in your new drive.
edit /etc/fstab to mount /dev/hdg5 as your new /