With vertical playback decks there is a risk that, when the pressure arm (4) is released in the stop mode, the expensive and fragile compact disc (1) may fall out. This risk is overcome by designing the centering piece (2) with a groove arranged in front of the centering diameter and by the provision, at the front end of the centering piece and at the rear wall of the groove, of a bevel edge of about 45o and, at the front wall of the groove, of a bevel edge of between 5o and 10o.