USB with audio units
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
The audio unit organizes the music folders and files in a similar matrix that appears on the USB drive. The exception to this matrix is music files that are not located in a folder. The audio unit automatically creates a folder titled ROOT or FOLDER 01 and lists all these playable music files in it. If your customer complains that they can't find some songs loaded on their USB drive, recommend that they check the ROOT folder or FOLDER 01 for the missing music files.