I just completed a so-called reinstall (on my 2013 MBA) and turns out it is anything but. It may have reinstalled the OS, but everything else remains as is. I want to do a 'hard' reinstall, like you could with with 10.6 and older. Pop in the OS installation DVD, reformat the system disk and do a clean install. Is that no longer possible or is there another way to do it nowadays? Thanks.