Pretend your SD card was empty.. if you open your SD card in a file manager, that would be the "base" or "root" of the SD card.. when you add another directory like the pandora folder those are called sub-directories.Where's the base directory?
Well I had a similar problem, but after I removed the battery and put it back it worked.when you have no clue how to help its better to avoid postingTake out the battery for couple minutes and put it back in.