Samsung SH-S162L-BEWN - Manual (Page 16)

and Connecting Cables
Installing DVD Writer
Connecting the Audio Cable (When Connected to the Sound Card)
To listen to the sound from the drive in Analog mode, connect the audio output on the DVD Writer
to the audio input of the sound card using an audio cable (4-pin).
Connecting the Digital output terminal.
For clearer sound, use a digital output terminal.
Digital output terminal is only available with the Sound card which support Digital output.
For using Digital output terminal, recommend to buy & use the sound card.