I've got an Edge card and a Sandisk 8GB micro sdhc. I've recently come across a problem when filling up more than half of the sd card (ie. using more than about 4GB). Let's say I've used up 3.9 GB of the card and I then put another title on it that takes it over 4GB. When I switch the DS on, the new title will not show up in the menu. If I then delete an older title (taking the contents of the card back down below 4GB) the new title will now show up in the menu and can be loaded. So basically, it seems that, though I can fill the card to it's 8GB capacity if I want, the Edge/DS will only read the first 4GB that was put on it. Anyone else come across a problem like this or have any idea why this might be happening ? Cheers.