GMC 2009 Envoy Denali Owner's Manual page 213

Empty Directory or Folder
If a root directory or a folder exists somewhere in the
file structure that contains only folders/subfolders and
no compressed files directly beneath them, the player
advances to the next folder in the file structure that
contains compressed audio files. The empty folder
does not display.
No Folder
When the CD contains only compressed files, the files
are located under the root folder. The next and previous
folder functions do not function on a CD that was
recorded without folders or playlists. When displaying
the name of the folder the radio displays ROOT.
When the CD contains only playlists and compressed
audio files, but no folders, all files are located under the
root folder. The folder down and the folder up buttons
search playlists (Px) first and then goes to the root
folder. When the radio displays the name of the folder
the radio displays ROOT.
Order of Play
Tracks are played in the following order:
•
If CD audio tracks are available they will be played
first, otherwise play begins from the first track in
the first playlist and continues sequentially through
all tracks in each playlist. When the last track of
the last playlist has played, play continues from the
first track of the first playlist.
•
If the CD does not contain any playlists, then play
begins from the first track under the root directory.
When all tracks from the root directory have
played, play continues from files according to their
numerical listing. After playing the last track
from the last folder, play begins again at the first
track of the first folder or root directory.
When play enters a new folder, the display does not
automatically show the new folder name unless the
folder mode has been chosen as the default display.
See DISPL (display) later in this section for more
information. The new track name displays.
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