I am purchasing a new hard drive for my Unibody Mid 2010 MacBook Pro. The hard drive is on its way and will be delivered today. I purchased Mavericks original through the AppStore. It is now downloading and shows to be 5.32GB in size. Normal DVDs are only 4.7GB so I am wondering, once it is downloaded, how do I move it onto the new hard drive to install? Should I try to get a dual layered DVD or should I use a USB drive?