I've been using the stock SD Card since launch, and just bought a new one. Every time I plug the old SD card into the card reader to copy the data, the drive shows up as being empty. Every time I try opening up up the SD Card when it shows up in My Computer, I get the message "Please insert a disk into removable drive N:" When I put the card back into my 3DS, the data seems fine, because I'm able to load my downloaded games just fine. My computer recognizes the card is there, because the card and drive letter show up under my Disk Management menu. It says that Drive N (the drive that the SD Card reader is assigned to) has 3.77 of unallocated space. So I know the card is being recognized by my machine.
Help, please.