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 from the computer-manufacturer Commodore Int'l.. The previous Amiga filesystem was never given a specific name and known originally simply as "DOS" or AmigaDOS. Upon the release of FFS and for purposes of differentiation, the original filesystem became retrospectively known as Amiga's Old File System, shortened OFS. The former file-system OFS, which was primarily designed for use with floppy disks, had been proving slow to keep up with hard drives of the era.

FFS was designed as a full replacement for the original Amiga filesystem. FFS differs from its predecessor mainly in the removal of redundant information. Data blocks contain nothing but data, allowing the filesystem to manage the transfer of large chunks of data directly from the host adapter to the final destination.