hi, I buy a new macbook pro, comes with some apps that I dont want... like iphoto and maybe comes used more hd that comes with... so my question is, is healthy reinstall the os... you know a fresh mavericks install from a usb? or that kind of os re-install can used a lot the ssd and is better avoid... I just say Im not an expert... and if yes is better format or nothing wrong with... which level of format is good? the normal like this: http://d.pr/i/ScCt ??? any help please, thanks!