What does CDFS mean in Unclassified?

CDfs

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. Yellow Book CD-ROM data: Apple HFS: Appears as a mountable HFS file system image. ISO 9660: Each session appears as a mountable ISO image file. El Torito boot File: Appears as a single bootable disk image file. CDfs is not included in the mainline Linux kernel, but is instead distributed as GPL-licensed source package used to create driver modules for a Linux kernel from 2.4 or 2.6-series. It can also be embedded into custom Linux kernel source package to appear among mainline file systems. In Plan 9 from Bell Labs, cdfs, is a 9P user-space server that operates similarly, presenting a Compact Disc as a directory of numbered files corresponding to disc tracks. Plan 9 cdfs, however, additionally allows disc recording.

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