I have 2 hard drives that had been used for Ubuntu Server 11.10. Now I would like to start from scratch with 12.04 but I'm having some trouble with the existing logical volumes and volume groups. Erasing data during install looks like it's going to take days. Is there a quick and simple way to wipe out all volumes/groups/partitions so I can start with 2 empty drives? When I set this up on 11.04 it took me a while to learn how to do it and I've since forgotten most of what I learned.

For what it's worth, I'm only using this box to learn about Linux.