So, I purchase a 64GB SDXC card from Best Buy, the PNY brand, cost me $50, I copy all the files from the old card to the new card, and I put the new card in, my DSi outputs an error, I retry, again another error, so I find a tool to format it to FAT32, I try that, error, retry, error, the next day, retry, I'm in! But wait a second, I'm wearing Apple's Earbuds (new, iPhone 5+), and what is that "whirring" noise? It appears to be loading, but it sounds like, quietly, "WHIRRRRRRRRRRRRRIRIRIRIRRRRRRRRRIERRRRIRWHIRWHHHIWHIR", and after it finishes, the noise stops. Several days later, probably 2, now today, I plug the card in using an adapter, everything glitches out, I use a different adapter, and... Oh! My GOD! What happened to all those files? I plug it back into the DSTWO, everything is GONE! DX, also, I noticed, if you peel back the label, you can see what appears to be the CPU... Is this normal?