["Debian"]
To move Debian from a HardDisk partition to other one (i.e. from hdg2 to hdg5).
mount /dev/hdg5 /mnt; mount /dev/hdg2 /mnt/boot/ .... and so on
then..
tar cvf - / || (cd ''mnt''; tar xvf -)
Change the ["root"] of the system.
chroot /mnt
And then modify ["grub"] config files in order to boot from your new hdg drive [don't use grub so I can't help you]. And execute grub? [ ok I would 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.