I miscalculated and installed 3 wads totaling 912 blocks onto my wii which had 849 blocks free. When I booted the Wii, it went right to the settings and said my Wii memory was full. It showed all three wads installed, with 0 blocks available. I moved all three wads to the SD card, still totaling 912, and only the 849 blocks were free again. The three games appear to be fine, as their banners load in the SD card menu. Where did the extra 63 blocks come from? That's about 10 MB. Was something overwritten in the Wii memory? Wii seems to work fine.