jedi4ever/veewee — comment on commit d67bd1d67774109660908b4bcee3f281af409e1c
File: templates/ubuntu-10.04.3-server-amd64/postinstall.sh line 72
By mitchellh:

Patrick,

It works by making all the end of a disk 0, which causes VirtualBox's compression to easily shave that off.

There might be something to be said of putting this more towards the end, but haven't seen any issue yet.

Mitchell