I have an 15" MBP I am selling and ordering a 13" smaller one for travel, etc. Can I simply put the "old" hard drive in the new laptop and vice versa? That way, I maintain everything on the new hard drive and can sell the old laptop without worrying about personal data, etc? Or is it a more convoluded process by which I can't just swap an already formatted hard drive w/ Boot Camp (read: Windows), etc. on it? Thanks!