I tried a Iomega 2,5 external HDD 500GB. The games started but stop within the first minut to play, the wii hangs and the only thing I can do is reset. A 4GB USB-stick works very well. What's the best thing to buy? A 2,5 or 3,5 external HDD? The Iomega is on the compatibility list and is noticed to work perfect, but did not at mine (yes, for less than a minute ...).