Siemens SINUMERIK 840D sl Commissioning Manual page 286

Service Commands
3.3 Generic elements
For this reason, only administrators are permitted to set up NFS file systems, and NFS is
usually only implemented in uniformly administrated environments. Exported file systems on
the server are addressed directly on the server via their path.
CFS (Compressed File System)
A CFS (file extension ".cfs") is a compressed file system, similar to a zip file. It contains files
and subdirectories that look like normal files on the controller at runtime. Files and directories
contained in a CFS cannot be changed. They are decompressed at runtime as required.
NFS (Network File System)
NFS is the most common protocol for remote file systems in the world of Unix, and is also
available for Windows. NFS is closely based on the Unix privilege model – each time a file is
accessed, a UID and GID are supplied which the server then uses to decide whether the
operation is permitted. The server relies on the client to provide the correct IDs.
Remote File System
A file system that is contacted over the network. The files are physically located on another
computer in the network (the "server"), but appear locally the same as all other files.
Operations performed on these files are sent via the network to the server, instead of being
executed directly on a local storage medium (such as a hard drive or CF card).
As a server usually exports more than one file system, a name for the required file system
must also be entered in addition to the name of the server.
SMB (Server Message Block)
SMB is the underlying protocol of MS Windows file systems (also known as drives, releases,
shares, etc.). SMB connections are always active in the context of a specific user, who must
be known to the server. Exported file systems have a name (release name), by which they
can be addressed. The client does not need to know the concrete path on the server.
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NCU Operating System (IM7)
Commissioning Manual, 01/2008, 6FC5397-1DP10-3BA0