Telefunken XH24J501VD-W Instruction Manual page 40

Note: Step 3 and 4 are available only when a menu is recorded
on the disc.
See instructions described in "Notes on Discs" to clean your
disc properly.
Note: Ensure that the DVD disc is in the tray with the label
facing forward.
For proper operation, only 12 cm discs must be used.