# Optical audio disc

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An **audio optical disc** is an [optical disc](/source/Optical_disc) that stores sound information such as music or speech. It may specifically refer to:

## Audio CDs

- [Compact disc](/source/Compact_disc) (CD), an optical disc used to store digital data (700 MB storage) - [Compact Disc Digital Audio](/source/Compact_Disc_Digital_Audio) (CD-DA), a CD that contains PCM encoded digital audio in the original "Red Book" CD-DA format - [5.1 Music Disc](/source/5.1_Music_Disc), an extension to the Red Book standard that uses DTS Coherent Acoustics 5.1 surround sound - [Compressed audio optical disc](/source/Compressed_audio_optical_disc), an optical disc storing MP3s and other compressed audio files as data, rather than in the Red Book format

## Audio DVDs

- [DVD](/source/DVD), 4 GB single layer, 8 GB double layer storage - [DVD-Audio](/source/DVD-Audio), a DVD that plays audio - [Super Audio CD](/source/Super_Audio_CD) (SACD), a format which competes with DVD-Audio

## Audio Blu-rays

- [Blu-ray](/source/Blu-ray), 25 GB single layer, 50 GB double layer - [BD-Audio](/source/BD-Audio), a Blu-ray disc that is capable of audio-only playback

## See also

- [Compatible Discrete 4](/source/Compatible_Discrete_4) (CD-4), a variety of quadrophonic audio for vinyl records

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Adapted from the Wikipedia article [Optical audio disc](https://en.wikipedia.org/wiki/Optical_audio_disc) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Optical_audio_disc?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.