I am planning to sell my MBP this month for the new 2012 design. What I want to do is backup the drive and then erase my current HDD by doing a 7-Pass erase. However, if I do this, will it also erase the capabilities to reinstall Lion by holding Command-R during the boot up cycle? I am afraid to erase my HDD and then not have an OS on it at all. Any help would be great!