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Boot File System

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Title: Boot File System  
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Subject: Dell Fluid File System, Synthetic file system, WinFS, Device file
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Boot File System

Developer Bell Labs
Full name Boot File System
Introduced (UNIX System V)
Partition identifier 0x63 (MBR)
Directory contents single inode table
File allocation 16bit Inodes
Max. filename length 14 characters
Supported operating systems UnixWare

The Boot File System (Named BFS on Linux, but BFS also refers to the Be File System) was used on UnixWare to store files necessary to its boot process.

It does not support directories, and only allows contiguous allocation for files, to make it simpler to be used by the boot loader.


Besides the UnixWare support, Martin Hinner wrote a bfs kernel module for Linux that supports it.[1]

He documented the file system layout as part of the process.[2]

The original BFS was written at AT&T Bell Laboratories for the UNIX System V, Version 4.0 porting base in 1986. It was written by Ron Schnell, who is also the author of Dunnet (game)

BFS was the first non-S5 (System V) Filesystem written using VFS (Virtual Filesystem) for AT&T UNIX.


  1. ^ Martin Hinner (1999). "UnixWare boot filesystem for Linux". Martin Hinner. Retrieved 2008-12-21. 
  2. ^ Martin Hinner (1999). "The BFS filesystem structure". Martin Hinner. Retrieved 2008-12-21. 
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