I am currently building a computer for the first time, and I was just wondering, what is the function of the boot drive? I mean, I know what it does, but I hear people all the time saying they put some games and the OS on it. Isn't it suppose to be there to boot JUST the computer? Or is it there to boot everything that needs....errr....booting? And if so, how can I tell what amount of storage is right for me?