Isuzu 2008 i290 Owner's Manual page 183

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 can use
more disc memory space than necessary. To conserve
space on the disc, minimize the length of the file,
folder, or playlist names. An MP3 CD 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 ignored.
Root Directory
The root directory is treated as a folder. If the root
directory has compressed audio files, the directory is
displayed as F1 ROOT. All files contained directly under
the root directory are accessed prior to any root
directory folders. However, playlists (Px) are always be
accessed before root folders or files.
2008 - Isuzu 290/370 Owner Manual
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 do not 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.
3-61