As someone mentioned a while back, it would be convenient to
be able to use floppies with non-standard formats, to get more
stuff on them.  I've just done some experimenting, with only
very partial success.  To access 3 1/2" hd floppies formatted
by the msdos program Fdformat v.18 with 82 tracks, 21 sectors
per track, I changed an entry in the table of types in
floppy.c, the later table with block sizes, and the "18" to "21"
in the declaration of the track buffer in floppy.c and head.s.
I put 0x0C for the gap length.

I can make a file system, store and retrieve files ok, but
the drive mutters a lot, files consume over twice the space
they do on the hard disk, and I can't unmount the device
after having used it.

What am I missing?  I haven't done anything about the sector
interleaving of 2 which, according to the Fdformat document
is necessary because "sectors are used as gaps".


--
Greg Lee <lee@uhunix.uhcc.hawaii.edu>