This just started happening today ... Formatted an 8gb microsd to exfat to try it out ... started moving some of my games off my 32gb fat32 microsd to see how it runs ... Ran great and as expected for the whole day ... I then put my 32gb back in and all of a sudden get a File System error ... I put the other card back in and it's the same error ... Restart my 3ds, format cards multiple times in exfat and fat32 ... still no dice. I keep trying the diagnostic tool and it fails on step 4. Could my 1 week old Gateway really be having read problems this early ? This gateway isn't a clone either and was back from reputable seller ... At my witts ends here, dont want to rma but I guess I have to. Anybody at all have any advice ?