I got an 2 GB Sandisk MicroSD and an R4, they're both pretty new, bought it about mid February this year. Anyway about a week ago my MicroSD card started say that; "USB Device Not Recognized, one of the USB devcices attached to this computer has malfunctioned, and Windows does not recognized it." I firstly thought there was something wrong with my computer's USB ports etc. So I plugged in some random USB that I had and it worked, nothing wrong with the USB ports. So I tried plugging in my MicroSD again and it still came up with this "USB Device not Recognized" error again. So then I thought the R4's MicroSD card reader was stuffed, so I found a SD card reader and tried it. To my disapointment it still came up with the "USB Device Not Recognized, one of the USB devcices attached to this computer has malfunctioned, and Windows does not recognized it." error. I'm thinking of buying a new MicroSD though my current one is worknig perfectly with the R4 when playing, the only problem is the "USB Device not Recognized" error when plugging it into the computer. Any solutions?