I am not really sure if this is the correct subforum for this topic, but here goes.. I received my 64 GB SD card on which I planned on installing rxTools emuNAND onto, and because my other SD card was full and I needed more space. It was, by default, formatted in exFAT. Windows did not have a Fat32 format for over 32 GB cards, so I used something called Fat32Formatter. I followed the instructions and when I tried to format it, my PC went black. When I restarted it it said "Operating System not Found". Windows Vista Home premium BTW (ugh) I guess the only way to fix this is to get a live CD for Windows Vista. But what exactly did I do wrong? I'm guessing the program somehow corrupted MBR (master boot record). If anyone else is using a 64 GB SD card for emuNAND, could you please tell me the steps you took to format it to FAT32?