Qcow2 轉成 physical disk

Qcow2 轉成 physical disk 的方式：

http://unix.stackexchange.com/questions/30106/move-qcow2-image-to-physical-hard-drive

http://askubuntu.com/questions/195139/how-to-convert-qcow2-virtual-disk-to-physical-machine-and-reversely