>
> I created a fdparm utility (derived from the fdformat(1) utility)
> which can be used to set the diskette parameters.

it sounds fine.

> Then I modified the fd.c driver (sys/dev/isa/fd.c) to provide a
> "persistent device".  The old fd.c driver allowed all the changes
> in parameters which fdformat provides, but after closing the device
> all changes were gone. This did not appear very useful to me. My
> "persistent device" remembers the changes to the configuration until
> it's changed again.
>
> Is there a chance that this can get integrated?

i wish so?

is it possible to read atari recorded 5.25" disks (160kB) with that?
it does use FAT filesystem but don't know what about sector layout.