the biggest 2.5" size available is a 250G. You can't get a 2.5" 320 or 500G drive (yet). If you go larger than 250G it will not work as it msut be a 3.5" drive. Hence, the 250G max size warning...
Trying to convince me the Wii is a real adult game machine 'if you play it right' is like trying to convince me Tofu tastes great 'if you just cook it right'







