Cadillac 2010 DTS Owner's Manual page 271

The root directory of the CD-R or CD-RW is treated as a
folder. If the root directory has compressed audio files,
the directory displays as F1 ROOT. All files contained
directly under the root directory are accessed prior to
any root directory folders. However, playlists (Px) are
always accessed before root folders or files.
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.
When the CD contains only compressed files, the
files are located under the root folder. The next and
previous folder functions do not display 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.
Tracks recorded to the CD-R or CD-RW play in the
following order:
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.
Playlists can be changed by pressing the
and folder buttons, the
SEEK arrows.
Play begins from the first track in the first folder
and continues sequentially through all tracks in
each folder. When the last track of the last folder
has played, play continues from the first track of
the first folder.
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.
The new track name displays.
knob, or the
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