Quote Originally Posted by bluszcz View Post
This is faster :

dd if=/dev/zero of=new.disk bs=1MB seek=1000 count=1
That creates a sparse disk that's really only 1MB in size. The actual size increases as you use more space. But that can lead to excessive fragmentation and I see that as a risk to the stability of the wubi install.

You can see the difference if you run:
du -h new.disk
du -h --apparent-size new.disk