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CDfs is a virtual file system for Unix-like operating systems; it provides access to data and audio tracks on Compact Discs. When the CDfs driver mounts a Compact Disc, it represents each track as a file. This is consistent with the Unix convention "everything is a file".

CDfs supports the following track types:


The Linux version of the CDfs driver is not part of the mainline Linux kernel.[citation needed]

In the implementation for the operating system Plan 9 from Bell Labs, cdfs is a server that runs in user space via the 9P protocol. It represents the mounted disc as a directory of files named by track number. Plan 9's CDfs can also write to the disc.