I have searched for an answer for this question ... it probably has been asked before ... but haven't found it so far. I need to know what my Chinese DVD/GPS 2 din car device calls the SD card in order to get IGO 3D cars to work. I have tried %SDCARD%, SDCARD, SD Card, Storage Card, and SDMMC ... no luck! The unit has no app to see the path to the NAV system; ...