OFS

The Amiga Old File System was the standard file system for Amiga floppy disks and hard drives with AmigaOS 1.0-1.2. Originally it was named the "Amiga File System" (FFS), but was superseded by the Fast File System released with Workbench 1.3 and was retrospectively renamed to "Old File System".

The filesystem originally came from TRIPOS, which formed the basis of AmigaDOS until Workbench 2.0 was released. The format has serious deficiencies; the main one being that each 512 byte block of data is 488 bytes of actual data and 24 bytes of metadata. The main difference between OFS and FFS is that FFS got rid of this metadata in data blocks, and instead wrote continuous blocks of raw data with no metadata in them.

Links

 * Amiga Old File System
 * OFS/FFS logical disk format