Chevrolet 2007 Colorado Owner's Manual page 235

The player is able to read and play a maximum of
50 folders, 50 playlists, 10 sessions, and 255 files.
Long file names, folder names, or playlist names
may use more disc memory space than necessary.
To conserve space on the disc, minimize the length
of the file, folder, or playlist names. You can also
play an MP3 CD-R that was recorded using no file
folders. The system can support up to 11 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, 50 playlists, 10 sessions,
and 255 files the player lets you access and
navigate up to the maximum, but all items over
the maximum are played.
Root Directory
The root directory 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.
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 have no 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 go to the root folder. When the
radio displays the name of the folder, the radio
displays ROOT.
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