Fast File System may refer to:
*
Berkeley Fast File System, as used by the various BSD variants
*
Amiga Fast File System
The Amiga Fast File System (abbreviated AFFS, or more commonly historically as FFS) is a file system used on the Amiga personal computer. The previous Amiga filesystem was never given a specific name and known originally simply as "DOS" or Amig ...
, as used by AmigaOS
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