Im gonna put in a new SSD in my mbp mid 2012. Do I will I need Osx on a usb or something or is there something in the machine that can just fetch it from the internet? I only found tutorials of people trying to back up what was already on there computer. Im not. I just want to start from scratch. that is to say I dont want any of the crap on my current hard drive on the new ssd. Only osx.