CDfs is the file system used to access the data on Compact Discs (CD). Typically the data are audio tracks.
CDfs is a virtual Linux file system that provides access to individual data and audio tracks on Compact Discs. A Compact Disc mounted with the "CDfs" driver appears as a collection of files, each representing a single track. It supports the following track types:
Red Book CD-DA audio: Appears as a WAV file; reading from it will start DAE ripping.
White Book VCD or SVCD video: Appears as a playable MPEG-1 file containing audio and video streams.