Filesystem or File system? One word or two? Did you know that “file system” and “filesystem” mean two different things?
It’s true! “File system” as two words refers to the layout of your directories, which includes things like the /dev directory that represent different hardware devices and don’t actually refer to files on your disk drive. If you use “filesystem” as one word it refers to the software that manages the files and directories such as Nautilius or Finder.