You can't install a desktop drive in a notebook. Currently, 500GB is about the limit for 2.5" hard disks, so you're pretty much out of luck. You can get this 640GB model, which is the highest-capacity I know of:http://www.newegg.com/Product/Product.aspx?Item=N82E16822136459
But $110 for an extra 140GB of space? Not worth it. It's better for you to just get an external hard disk.