(FS, or "filesystem") 1. A system for organizing {directories} and {files}, generally in terms of how it is implemented in the {disk operating system}.  E.g., "The {Macintosh file system} is just dandy as long as you don't have to interface it with any other file systems". 2. The collection of files and directories stored on a given drive (floppy drive, hard drive, disk {partition}, {logical} drive, {RAM drive}, etc.).  E.g., "mount attaches a named file system to the file system hierarchy at the pathname location directory [...]" -- {Unix manual page} for "mount(8)". As an extension of this sense, "file system" is sometimes used to refer to the representatation of the file system's organisation (e.g. its {file allocation table}) as opposed the actual content of the files in the file system. {Unix manual page}: fs(5), mount(8). (1997-04-10)