In this example, the machine has 1 disk (8 GB), we want to clone it to an external disk (20 GB). This is a normal case when you buy a new disk to replace old disk on your machine. Here since we use virtual machine to give this example, we use small disk size, i.e. 8 GB to 20 GB instead of modern disk size.
Besides, modern “light” laptop normally comes WITHOUT CD drive, or you happen to leave your USB CD drive in another place, it’s a good idea to use USB device to boot Clonezilla live. In this example, we use a better, neater method, i.e. put Clonezilla live on the new disk and use it to boot clonezilla live. By doing this, you do not have to burn a CD, or prepare another USB flash drive. This is an one-time-use Clonezilla live, because later the clonezilla live files on new disk will be overwritten. Of course, you still can put Clonezilla live in CD or USB flash drive, then boot it to clone the 8 GB disk to 20 GB disk. The procedure is quite similar. Just remember to choose the correct source and destination disk.
Prerequisite: A new, equal or larger disk, an external disk closure, an USB cable. A running MS Windows or GNU/Linux.

• Put the new disk inside your external disk closure, connect that to your running MS Windows or GNU/Linux via USB cable, then follow here to put Clonezilla live zip file on your external disk and make it bootable.

• Insert the new hard drive (which is bootable with Clonezilla live builtin) with the USB cable to your machine.
• Most modern PC comes with USB boot function, you can refer to your montherboard manul to see how to set it during boot. E.g. On the IBM thinkpad X61, you can press F12 and choose USB device to force the machine to boot via USB device.

The default keyboard layout is US keybaord, therefore if you are using US keyboard, just press enter (i.e. use the option “Don’t touch keymap”).
If you want to change keymap, you can either choose “Select keymap from arch list” or “Select keymap from full list”.
///NOTE/// There is a bug when choosing French keymap in “Select keymap from arch list”, so use “Select keymap from full list” to change keymap if you are using French keyboard.

Choose “device-device”

Choose “Beginner”

If you choose “Expert” mode, you will have some chances to choose advanced parameters, e.g. tune the CHS values of target disk, how to create partition table on the target disk, etc.. You can see more details here.

///NOTE/// By deafult, Clonezilla will clone the “same” size of source disk to target disk. i.e. in this example, only 8 GB will be cloned to target disk, so the rest of 12 GB on the destination disk will be unallocated. If you want to make use all of the target disk size, remember to enter “Expert” mode and choose option “-k1”.

By default we will choose later, but if you have decided, you can choose to reboot or poweroff the machine.

Clonezilla shows you the complete command to run this disk to disk clone action: 

Then it will create partition table on the destination disk:

Clonezilla is cloning the data from source disk to target disk:

Then we choose poweroff:

and the machine will be halted:

That’s all. The new hard drive is ready to be used. You can remove the old (8 GB) disk from your machine, and put the new one (20 GB) in your machine. Boot it, you can enjoy the new disk.
//NOTE// You can only keep one of the disks in the same machine before you boot it. If you boot the machine with the source disk and the cloned destination disk on the same machine, the booting OS will be confused since there are two identical file systems on the same machine. They have same UUID so the booting OS might mount the wrong file system.