VirtualBox: increase size of disk

VBoxManage modifyhd openSUSE\ file\ server.vdi --resize 16000

-download System Rescue CD from here: http://sourceforge.net/projects/systemrescuecd/
-boot the vm from the CD
-at the command prompt type startx
-when X Windows starts, type gparted in the terminal that is open on screen
-in gparted select the root partition and drag it to the bigger size
-when it's done right click on the disk and choose Manage Flags, and make sure it is set to Boot
-exit gparted and power off the 
-boot the VM into your nw install on it's new bigger disk!
gparted under the xfce rescue system