I don't know what's going on with your experience but I've been using a 16GB stick without any problems at all.Don't get a high capacity memory stick. It seems the Elantra can only read memory sticks 2GB or less. Every 4GB and 8GB stick I've tried in the car has failed, no matter how it was formatted. Every 2GB stick works. So save your money and buy cheap 2GB sticks.