BMW 730i Owner's Handbook Manual page 192

Malfunctions with individual CDs/DVDs
If malfunctions occur only with individual CDs/
DVDs, this can have one of the following
causes.
Self-recorded CDs/DVDs
Causes of malfunctions with self-recorded
CDs/DVDs are, e.g. non-uniform data-creation
and copying methods as well as low quality or
rapid ageing of the blank disc being used.
Only write on the upper side of CDs/DVDs using
a special marker pen.
Damaged CDs/DVDs
Avoid causing fingerprints and protect against
dust, scratches and moisture.
Store CDs/DVDs in a case.
Do not expose CDs/DVDs to temperatures in
excess of 506/1227, high atmospheric
humidity and direct sunlight.
CDs/DVDs with copy protection
CDs/DVDs are often copy-protected by the
manufacturer. This could result in CDs/DVDs
being impossible to play, or only playable with
restrictions.
Care notes
For useful information on this subject, see the
booklet Looking after your car.
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