Editing Amiga Fast File System (section)

{{Short description|File system used on Amiga computers}}
{{Distinguish|Berkeley Fast File System}}
{{Infobox filesystem
|name      = A<u>FFS</u>
|full_name = Amiga&nbsp;Fast&nbsp;File&nbsp;System
|developer = {{nowrap|[[Commodore International]]}}
|introduction_os = {{nowrap|[[AmigaOS]] v1.3}}
|introduction_date =1988
| preceded_by = [[Amiga Old File System|''Old File System'']]
|variants ={{unbulleted list
| <small>OFS (Non-intl.)</small>
| <small>FFS (Non-intl.)</small>
| <small>OFS (Intl., no DirCache)</small>
| <small>FFS (Intl., no DirCache)</small>
| <small>OFS (Intl., DirCache)</small>
| <small>FFS (Intl., DirCache)</small>}}
|partition_id = ([[Amiga rigid disk block|RDB]]):<ref name="AmigaWiki">{{cite web |url=https://www.amigawiki.org/doku.php?id=de:system:filesystem |title=Filesystem |website=www.AmigaWiki.net |date=2019 |access-date=23 January 2025}}</ref>
{{unbulleted list
|<small><code>DOS\{{abbr|x00|Values in C-notation for hexadecimal numbers}}</code> (Non-intl.)</small>
|<small><code>DOS\x01</code> (Non-intl.)</small>
|{{nowrap|<small><code>DOS\x02</code> (Intl.,no&nbsp;DirCache)</small>}}
|<small><code>DOS\x03</code> (Intl.,no&nbsp;DirCache)</small>
|<small><code>DOS\x04</code> (Intl., DirCache)</small>
|<small><code>DOS\x05</code> (Intl., DirCache)</small>}}
|file_struct = [[bit array|bitmap]]
|bad blocks struct = 
|max_filename_size = 30
|max files no      = 
|max_volume_size   = 4 [[gigabyte|GB]]
|max file size     = 
|filename character set = 
|dates recorded  = 
|date range      = 
|date resolution = 
|forks streams   =
|attributes      = filenote
|file system permissions = 
|compression      = No 
|directory struct =
|encryption       = No
|OS = [[AmigaOS]]
|bootable = Yes
}}

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 International|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 Old File System|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 block]]s 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.