Cloning VM image .vmdk in VMWare ESXi 4.1

Steps:

1: Login in service console
2.: Press Alt+F1
3: type "unsupported"
4: enter password

5: vmdkfs -i /vmfs/volumes/<source path of VMware HDD>/source.vmdk /vmfs/volumes/<dest path of VMware HDD>/dest.vmdk

100% clone done.

Thats it.