2 Differences between DNFS and HDFS

The HDFS has some real advantages over the DNFS. These include.
    Hierarchical directories
	The HDFS has a fully hierarchical directory structure, allowing
	more than the 31 files per disc side of the DNFS.
    40/80 track switching
	If the HDFS is used with an 80 track disc drive, it can
	automatically detect 40 track discs and read and write to these
	discs without manual intervention.
    Advanced tube support
	The HDFS includes the Acorn Tube Support code, with the extra
	feature of being able to turn off the Tube from software.
    Sideways RAM support
	All of the memory moving, loading and saving operations can access
	any sideways ROM socket, allowing multiple banks of sideways RAM to
	be supported.
    Large files
	If the HDFS is used with double sided disc drives, it can split
	files across both sides of the same disc, allowing files up to 400k
	long.
    Low memory loading
	The HDFS can load files into memory which would normally take too
	much space, automatically disabling itself after the file is
	loaded.
    Open files
	The HDFS supports a total of six files open simultaneously, one
	more than the DNFS.
    More commands
	The HDFS has many more commands than the DNFS, including a fully
	featured disc, file, and memory editor, disc and memory searching,
	memory block moving, and a lot more.
    DNFS compatibility
	The HDFS is also able to read, write, and format DNFS compatible
	discs.

The majority of programs designed to work under DNFS 1.20 will work under
HDFS with no change. Where changes have been required, it has usually been
because the program's author(s) have made invalid assumptions about
command parsing or memory usage.