Convert VDI to Physical Harddisk

Part 1: Copy VM to Physical Harddisk:
Option 1:

Shutdown your (i.e) source.vdi completely
Use USB-HDD adaptor, plug in the target harddisk
Get GParted LiveCD ISO
From root user, create new VM using wizard and directly mount the detected USB-HDD adaptor
Add GParted LiveCD ISO and source.vdi to the VM, and set it to boot from CD
Start the VM, GParted launched
Copy the whole partition from source to target & resize the copied partition if necessary.
Shutdown the VM

Option 2:

Shutdown your (i.e) source.vdi completely
From root user, create (i.e) target.vmdk from (i.e) /dev/sdb using this command: VBoxManage internalcommands createrawvmdk -filename target.vmdk -rawdisk /dev/sdb
Get GParted LiveCD ISO
From root user, create new VM using wizard and directly mount target.vmdk (theoritically it can be mounted after the VM wizard complete but I always got un-explainable error)
Add GParted LiveCD ISO and source.vdi to the VM, and set it to boot from CD
Start the VM, GParted launched
Copy the whole partition from source to target & resize the copied partition if necessary.
Shutdown the VM

Part 2: Fix GRUB from physical hardware: