VirtualBox

resize a virtual disk command;

http://www.virtualbox.org/manual/ch08.html#vboxmanage-modifyvdi

http://www.webupd8.org/2011/02/how-to-easily-resize-virtualbox-40-hard.html

VBoxManage modifyhd YOUR_HARD_DISK.vdi --resize SIZE_IN_MB

$ VBoxManage internalcommands sethduuid ~/VirtualBox\ VMs/xpSP2-genstats/xpSP2-genstats-disk1.vdi UUID changed to: 3912b25a-1489-4d2b-9ba1-e353d1bfc570

http://michail.flouris.net/2011/11/virtualbox-vm-disk-clone-uuid-problem/