It was discussed here about copy protection problems - fuzzy data in track dump, what is not supported by Pasti (at least earlier versions).
For Marcer (and others) : Owners of double sided drives don't need third disk, because it's same as side B of second disk. Side B of first is for determining is drive single or double sided. In any case, if you have undamaged original there must be data on third floppy.
Negative feedback has usually positive effect.