<operating system> (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).
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