Volvo C30 Owner's Manual page 264

10 Infotainment system
CD functions
CDs
Using low quality CD discs could result in poor
10
or non-existent sound.
IMPORTANT
Only use standard discs (12 cm in diameter).
Do not use CD discs with adhesive disc
labels. The heat in the CD player may cause
the label to come off, damaging the
CD player.
264