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Control systems
COMAND audio CD/audio DVD/MP3
This means that it is only possible to ac-
cess the MP3 tracks. Access to the audio
CD tracks is not possible.
File structure on a disc
When you create an MP3 disc, the MP3
tracks can be organized in folders. A folder
can also contain other folders. A disc can
contain a maximum of 255 folders. Each
folder can contain a maximum of
255 tracks and 255 folders. A disc can
contain a maximum of 4000 tracks. Usual-
ly this number will not be reached because
each minute of an MP3 track requires ap-
proximately 1 MB of storage space.
Track and folder names
When you create an MP3 disc, you can as-
sign names to the MP3 tracks and folders.
COMAND uses these names for the corre-
sponding display in MP3 mode. Empty fold-
ers or folders which contain data other
than MP3 tracks are not displayed by
COMAND.
If MP3 files are saved in the root directory
itself (uppermost directory on storage me-
dium), the root directory will also be treat-
ed as a folder. COMAND will then show the
name of the root directory as the folder
name.
You must observe the following when as-
signing track names:
ț Track names must have at least one
character.
ț Track names must have the extension
“mp3”.
ț There must be a period between the
track name and the extension.
Example of a correct track name:
Track1.mp3
COMAND is unable to recognize an MP3
track if:
ț there is no period between the track ti-
tle and the extension
ț there is no extension
Permissible MP3 formats
COMAND supports the MPEG1 Audio Lay-
er 3 format.
Permissible bit and sampling rates
ț Fixed and variable bit rates up to
320 kbit/s
ț Sampling rates of 24 kHz – 48 kHz
Notes on copyright
The music tracks that you create for MP3
mode and can play back in MP3 mode are
generally subject to copyright protection in
accordance with the applicable interna-
tional and national regulations.
i
COMAND does not support ID3 tags.
i
This format is generally known as “MP3”.
i
Only use MP3 tracks with a bit rate of at
least 128 kbit/s and a sampling rate of at least
44.1 kHz. Smaller rates can cause a noticeable
deterioration in sound quality. This is especially
the case if you have activated a surround sound
function.