CITROEN DS3 Handbook page 344

Playing an MP3 Cd
compilation
Insert an MP3 CD compilation in the player.
The audio equipment searches for all of the
music tracks, which may take anything between
a few seconds and several tens of seconds,
before play begins.
On a single disc, the CD player can
read up to 255 MP3 files spread over
8 folder levels. However, it is advisable
to keep to a limit of two levels to reduce
the access time before the CD is
played.
While the CD is being played, the folder
structure is not followed.
All of the files are displayed on a single
level.
To play a disc which has already
been inserted, press the SOURCE
button several times in succession
and select Cd.
Press one of the buttons to select a
folder on the CD.
Press one of the buttons to select a
track on the CD.
Press the LIST REFRESH button to
display the list of directories of the
MP3 compilation.
Press and hold one of the buttons for
fast forward or backward play.
Information and advice
The audio system will only play files with
the extension ".mp3" with a sampling rate of
22.05 KHz or 44.1 KHz. No other type of file
(.wma, .mp4, .m3u...) can be played.
It is advisable to restrict file names to
20 characters without using special characters
(e.g. " ? ; ù) to avoid any playing or displaying
problems.
In order to be able to play a recorded CDR
or CDRW, when recording, the ISO 9660
level 1. 2 or Joliet file format is recommended.
If the disc is recorded in another format, it may
not be played correctly.
It is recommended that the same recording
format is always used for an individual disc,
with as low a speed as possible (4x maximum)
for optimum sound quality.
In the particular case of a multi-session CD, the
Joliet format is recommended.