I recently purchased a Samsung A920 cell phone for the purpose of the mp3 and expandable memory capacity. I also purchased an inexpensive USB SD card writer/reader, as well as a 512 Micro SD memory card. The writer/reader functions perfectly using a standard SD memory card, yet I can't seem to get the micro card in the SD adapter to function. Every time I attempt to explore the micro card, My Computer hangs up, or I have to use the Task Manager to end the process. If I attempt to drap and drop a file to the card, I get a "Disk is write protected" error, or even"Please insert disk into drive x." I have tried using a different memory card with no effect. Any help would be appreciated.