Is there any way to allow the phone to access an sdcard when plugged into a data USB connection? I am attempting to plug my phone into my car stereo to play music files on my external sdcard while driving. The car stereo is able to play all of the music files but my GPS software becomes unuseable because it's data files are stored on the internal storage card which becomes inaccessable to the phone when plugged into a USB cable. I would like to find a way to allow the phone to access the internal card only when plugged into a USB connection so I would be able to perform both functions. Phone is rooted.