Are you formatting the SD cards on a Mac or a PC? From memory, a few people on other threads had issues when formatting SD cards on MACs. Also what capacity SD cards are you using? I had issues with cards larger then 2GB in my previous VW R36 Passat (fixed with a firmware update), but I'm not sure if there is a limitation on SD cards with the mk7 entertainment unit. I'm using both 16GB and 32GB SD cards in my MY15 Golf R without any issues.