Boot File System
Encyclopedia
The Boot File System was used on UnixWare
UnixWare
UnixWare is a Unix operating system maintained by The SCO Group . UnixWare is typically deployed as a server rather than desktop. Binary distributions of UnixWare are available for x86 architecture computers. It was originally released by Univel, a jointly owned venture of AT&T's Unix System...

 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.

Implementations

Besides the UnixWare support, Martin Hinner wrote a bfs kernel module for Linux
Linux
Linux is a Unix-like computer operating system assembled under the model of free and open source software development and distribution. The defining component of any Linux system is the Linux kernel, an operating system kernel first released October 5, 1991 by Linus Torvalds...

that supports it.

He documented the file system layout as part of the process.
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