a slot - in optical recording and / or reproducing apparatus includes a case formed with a slot and a swingable cover . the case provides a housing for adopting components of the slot - in optical recording and / or reproducing apparatus . the optical disk is drawn out of / into the slot - in optical recording and / or reproducing apparatus through the slot . the swingable cover is used to expose / block the slot to / from the exterior of the slot - in optical recording and / or reproducing apparatus .