I have a car with a built in USB port in the OEM radio. With this USB port i can play music as long as the USB deivce (USB stick, Hard Drive etc) is formatted FAT32. Previously I had a Droid X and with that set to USB Mass Storage it worked just fine. It would scan the removable SD card and find the music and then I would have selections on the radio for Artist, Genre, Album, Song and Random. If i connected the Droid X to my Windows Computer i only had one drive added and that had the contents of the removable SD card.
Now move to the Droid 4. If I set it for USB Mass Storage and connect it to my computer i now get three (3) drives show up 1. Moto Cast as a CD Drive format 2. MOT as a FAT32 format (internal storage) and 3. Removable Disk as FAT32 format (removable SD Card) So now my car is not seeing the Removable SD drive it is seeing the Moto Cast Drive which is in CD format and will not recognize either of the other memory locations (internal or removable)
So my question is. Is there any way to make the removable SD card the first storage device seen by the USB port in my car?