Expandir partição . VMDK em Virtualbox, Windows

1 - Converter para formato VDI
C:\Program Files\Oracle\VirtualBox>VBoxManage clonehd D:\Ubuntu_VDI_HD\UbuntuClouServer.vmdk "G:\temp_hd\hd.vdi" --format vdi
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Clone medium created in format 'vdi'. UUID: cc829ae4-e352-4744-a3b0-9a8ae712ada3

 2 - Fazer o resize do disco
C:\Program Files\Oracle\VirtualBox>VBoxManage modifyhd "G:\temp_hd\hd.vdi" --resize 81920
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

3 - Nova conversão para vmdk
C:\Program Files\Oracle\VirtualBox>VBoxManage clonehd "G:\temp_hd\hd.vdi" "D:\Ubuntu_VDI_HD\UbuntuClouServer-80GB.vmdk" --format vmdk
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Clone medium created in format 'vmdk'. UUID: a7fc73b3-e4c3-4669-ba2d-1f4f1dd74a30