/ is almost used up, want to shift some spaces from /home to /, reduce /home from 15G to 10G at virtual disk,
created 10G of home.disk is fine,
after cp, i copied 15G to home.disk,
as i have expanded my /home recently, 10G should be quite enough, did i miss some options at cp command?
(installed ubuntu 9.10 by wubi in winXp sp3)

cd /host/Ubuntu/disks/
mv home.disk home.backup
sudo sh wubi-add-virtual-disk /home 10000
cp -r home.backup home.disk