Hi, I have a MacBook Pro MD102, 2012 model, and I want to Bootcamp it with Windows7 Ultimate. During the Bootcamp process it requires the Machintosh HD to be partitioned. My question is; During partitioning, is it also formatting the partition with the MacOs installed in it? I mean that I will have to reinstall everything on my MacOs? Or it just takes a piece of my hard drive and the remaining stays as it was? Thanks