Chevrolet 2006 Epica Owner's Manual page 178

You can also play an MP3/WMA CD that was recorded
using no file folders. The system can support up to
8 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, 5 sessions, and 999 files the player will
let you access and navigate up to the maximum, but
all items over the maximum will be ignored.
Root Directory
The root directory will be treated as a folder. If the root
directory has compressed audio files, the directory
will be displayed as ROOT. All files contained directly
under the root directory will be 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 will
advance to the next folder in the file structure that
contains compressed audio files and the empty folder
will not be displayed or numbered.
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No Folder
When the CD contains only compressed files, the
files will be located under the root folder. The next
and previous folder functions will have no function on
a CD that was recorded without folders or playlists.
When displaying the name of the folder the radio will
display ROOT.
When the CD contains only compressed audio files,
but no folders, all files will be located under the
root folder. When the radio displays the name of the
folder, the radio will display ROOT.
Order of Play
Tracks will be played in the following order:
•
Playback will begin from the first track under the
root directory.
•
When all tracks from the root directory have been
played, playback 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.