The cofs device is used to directly access files and directories of a Windows host system from a coLinux guest system. Please note: The cofs device is new in coLinux 0.6.2. It's still in the experimental phase and is very buggy! So don't blame us if it breaks your disk ;)... YES it is, it crashed my server when I tried to rename a file from within coLinux This and other crashes are fixed in coLinux 0.6.3. Please see Cofs in 0.6.3 for a description how to use it there. I could not find a documentation on the cofs device in this wiki, so I will relate what I found with Google: