VBoxManage clonehd “/Users/xiaomingwang/Documents/tmp/box-disk1.vmdk” “/Users/xiaomingwang/Documents/tmp/box-disk1.vdi” –format vdi
vboxmanage modifyhd /Users/xiaomingwang/Documents/tmp/box-disk1.vdi –resize 51200
VBoxManage clonehd “/Users/xiaomingwang/Documents/tmp/box-disk1.vdi” “/Users/xiaomingwang/Documents/tmp/box-disk1.vmdk” –format vmdk