Nicely done, sir.

If these last steps work out, shouldn't the patient
modify his /etc/fstab accordingly?

I note that in some earlier versions of Knoppix, there used to
be an entry in /etc/fstab of the form:
/dev/fd0 /floppy auto defaults,user,noauto 0 0
or, using your terminology,
/dev/fd0 /media/fd0...etc.

If Knoppix 6.4.3 doesn't mount floppies automatically,
then hopefully we can click File Manager to mount fd0.
If not, we may still need a clickable icon on the desktop,
in addition to the mkdir and fstab additions here.

For what it's worth, when I plug in my USB floppy,
Knoppix 6.4.3 adds the following to my /etc/fstab, and
vfat stuff shows up in File manager to be read, etc:

# Added by KNOPPIX
/dev/sdc /media/sdc vfat noauto,users,exec,umask=000,shortname=winnt,uid=kn oppix,gid=knoppix 0 0

I have a usb floppy to read some old stuff of mine.
Would you believe GWBasic?

You are in good hands. These guys, and Harry know
Knoppix inside out.