I purchased an M3 Real cart a little over a month ago, and have had no problems with it up until now. I was copying games into the NDS directory on my MicroSD HC card using the USB adaptor included with the M3 Real, and in the middle of copying a file, my computer suddenly did not recognize the card, and reported it couldnt find the path specified. I tried unplugging it and plugging it back in, and every time I would hear the the USB device connected noise, and a second later, the USB device disconnected noise. I tried rebooting, and plugging it in again, and windows said something along the lines of "H:\" could not be read" (H is the drive letter that has normally been used for my removable storage devices). Anyways, now my computer won't even read that the USB device is plugged in (no USB connected noise). However, I can still access most of the data on the card using my DS. The only exception is my GBA diectory, which freezes up the DS when I try to access it. So, am I just screwed now and have to buy a new MicroSD card or what? Any suggestions are very welcome!
Problem Solved! Turns out the USB reader that came with the M3 Real just stopped wrking. I got a new reader along with a new card, and was able to fix my old card with the reader.