I have a Garmin 4208 and I am having a problem with the SD Drive. I leave an SD drive in the machine that has G2 vision charts on it. I also save my tracks on that card. When I go to save the user data to the SD drive, I get an error message that says the SD drive is not there. I remove the SD drive and then put it back in and the machine recognizes it. Has anyone else made this problem and where you able to fix it?