try reading the floppy on the slowest pc you can find.
Was the floppy written to on a pc,or something else, like a mac?
If the floppy is very old, could it have been used as DD, when it has the extra hole for HD?
Not sure what you mean by 2HD when describing the floppy.
Nbrane - surely debug will not work, if the pc does not see the floppy as formatted.
Good Luck - Keep us posted.