I have the 32GB Wii U Deluxe and just noticed that it only has about 4GB of free space. I have only Super Mario U (1.8GB) and the save data for Nintendo Land (300MB) showing in the data management screen. I understand that there's about 7GB used for system files so by my calculation that leaves about 19GB unaccounted for. What is using up the storage on my Wii U!?
Anyone have any ideas? I'm considering choosing the "Delete All Content and Settings" option and starting over just to see if I can recover the lost space. I'd hate to lose my save games for Super Mario U though...