Cadillac CTS 2008 Owner's Manual page 249

Playlists can be selected by using the previous and next
folder buttons, the SEEK arrows,
buttons. An MP3/WMA CD-R or CD-RW that was
recorded using no file folders can also be played. If a
CD-R or CD-RW contains more than the maximum of
50 folders and playlists, and 255 files, the player lets you
access and navigate up to the maximum, but all items
over the maximum are not accessible.
The HDD Radio can support more than 255 files on an
MP3/WMA disc.
The HDD Radio does not support playlists on a disc or
USB storage device.
Root Directory
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 DISC. All files
contained directly under the root directory are accessed
prior to any root directory folders. Playlists (Px) are
always accessed after root folders or files.
The HDD Radio displays the root directory of an
MP3/WMA disc as F1 MP3 and the root directory of a
USB storage device as F1 USB.
\ FWD, or s REV
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.
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 display on a CD that was
recorded without folders or playlists. The radio displays
F1 DISC for the root directory.
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. The radio displays F1 DISC for the root directory.
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