Pontiac Wave 2009 Owner's Manual page 172

The player is able to read and play a maximum of
50 folders, five sessions, and 999 files. Long file names
and folder names can use more disc memory space
than necessary. To conserve space on the disc,
minimize the length of the file and folder names. An
MP3/WMA CD that was recorded using no file folders
can also be played. The system can support up to eight
folders in depth, though, keep the depth of the folders
to a minimum in order to keep down the complexity and
confusion in trying to locate a particular folder during
playback. If a CD contains more than the maximum of
50 folders, five sessions, and 999 files, the player
lets you access and navigate up to the maximum, but
all items over the maximum are ignored.
Root Directory
The root directory is treated as a folder. If the root
directory has compressed audio files, the directory is
displayed as ROOT. All files contained directly under the
root directory are accessed prior to any other directory.
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.
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No Folder
When a CD contains only compressed files, the files are
located under the root folder. The next and previous
folder function does not function on a CD that was
recorded without folders or playlists. When displaying
the name of the folder the radio displays ROOT.
When a CD contains only compressed audio files, but
no folders, all files are located under the root folder.
When the radio displays the name of the folder, the radio
displays ROOT.
Order of Play
The player play will begin from the first track under the
root directory. When all tracks from the root directory
have been played, play will continue from files according
to their numerical listing. After playing the last track
from the last folder, the player will begin playing again
at the first track of the first folder or root directory.