I am considering an external hard drive for recording live bands. I have a 2000 Mini 2.3 i7, 16 gig memory and the stock 5400 HD. I also have a Presonus FireStudio Mobile and will be getting a Mackie 1640i. So recording up to 16 tracks (with firewire) what HD would work for 4 hours of live recording? As well as be plenty fast enough? http://eshop.macsales.com/shop/ministack I am thinking of one of these as it will fit with the Mini on a 1 rack space rack drawer.