The ATAPI CD-ROM connector is a 1 x 4-pin connector that connects an internal ATAPI CD-ROM drive to the audio mixer. The connector typically appears as shown in the following graphic.
Not all Intel® Desktop Boards include this CD-ROM connector, but instead include a digital audio solution that does not require an additional cable connection between the CD-ROM drive and the CD-ROM connector.
To enable digital audio, your CD-ROM/DVD drive must support digital audio and must be enabled for it. Check the properties of your CD-ROM/DVD drive in Device Manager (see example below).