William Lam of virtuallyGhetto comments:
A couple of weeks back I had the pleasure of meeting Anders Madsen who is the lead engineer for the very popular and useful tool called ovftool. While having a discussion on a variety of topics with Anders I came to learn about a cool little feature of the OVF specification call Dynamic Disks. This lesser-known feature has actually been around since OVF 1.1 but I suspect that most people have probably not heard of this capability unless you are intimately familiar with the OVF format which I I know I am not.
A deep look at a feature in OVF that most people will want to use to cut down on disk sprawl.