Scripting
Resize Virtual Box Disks
!! How to resize a VMWare vmdk in VirtualBox
Courtesy of Luca Borrione at http://stackoverflow.com/questions/11659005/how-to-resize-a-virtualbox-vmdk-file
VBoxManage clonehd "source.vmdk" "cloned.vdi" --format vdi VBoxManage modifyhd "cloned.vdi" --resize 51200
The above will resize the hard disk up to 50GB (50 * 1024MB). If you want to turn it back into a vmdk to use in VMWare?:
VBoxManage clonehd "cloned.vdi" "resized.vmdk" --format vmdk