Linux should be able to read them: there may even be a pre-set format for
them.
/dev/fd0H1680 (major 2, minor 44) should be a 21x2x80 3.5" floppy.
/dev/fd0H1722 (major 2, minor 60) should be a 21x2x82 3.5" floppy.
/dev/fd0H1743 (major 2, minor 76) should be a 21x2x83 3.5" floppy.
As to whether they actually work, I don't know. You can also create your own
geometries with the set_geometry ioctl - I think there is a "superfloppy"
package somewhere (Alain?) that contains the stuff to do all this.
> PS. Yes, I've looked at floppy.c in the kernel source...
My condoleances. It's horrible. A rats nest of code that is totally
incomprehensible. The only thing that excuses some of the code is the fact
that the hardware itself is such a rats nest. Ugh.
Oh, btw: check out "http://www2.us.com/msd1/msd1/dmf.html". It looks like
DMF is the 21x2x80 format (the first one on my list).
Linus