To access a virtual device imported into colinux, you must first have setup an appropriate block device in your /dev file system. By convention, these devices are named /dev/cobdN, where N in the index number of an element in the XML configuration file. Incidently, "cobd" stands for "Colinux Block Device." The block device nodes should be existing, if you use a Linux image provided by the coLinux community. If you do not yet have such devices on your system, you'll need to create them. This is done with the mknod command (running as root): Alternatively, you can do them all at once like this: