I have just upgraded from the original moto droid to a thunderbolt and overall I am in heaven. With my motodroid I could simply plugin the usb port and unmount the sdcard and the Car stereo would take over. Now I get reading error once the Thunderbolt goes into disk drive mode. Big difference I notice is the car is saying that is starting ipod. I don't think this has happened in the past, so I'm wondering if it is something to do with the way phone is communicating. What I have already done. I read on some droid x forums that this was an issue, but found no real clue. I also read something about SD cards becoming read only and tried moving my music folder into the media folder. I also mirrored the way it was setup on my motodroid. None of this works. If someone has an actual technical explanation instead of a shot in the dark, I'd really appreciate the help.