So I have recently purchased one of the new retinas for myself. But my old MacBook Pro I am giving to you my lil bro for xmas. I do however want to format and install Mavericks on it for him. I got this MBP way back in 2011 so the OS X with the disc is Leopard I think. What is the easiest way of going about a format and installing of Mavericks? Thanks for any help guys!