USB with audio-navigation units
When you plug in a USB drive, the audio-navigation unit automatically searches the USB drive for playable music files. See the owner's manual for more information about navigating USB menus, selecting music, and music file compatibility.
The audio unit organizes the playable music folders and files that appear on the USB drive. If there are any music files that are not located in a folder, the audio unit automatically creates a folder titled ROOT, 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 for the missing music files. If all the music files on the USB are in folders, the ROOT folder does not appear.
When there are music files not located in a folder, the audio-navigation automatically creates a folder named ROOT (A).
Select the Track List button to see the ROOT folder (A) which is automatically created only when there are music files not located in folders.
All the music files not located in folders are listed under the ROOT folder.