[StillBored]

The first two methods were dead on arrival with copy ][+'s track copier. It could do whole track copies as long as it could identify a starting point for the track. Later versions were even smart enough to use a simple substitution database, and sector location information (for sectors stored on quarter tracks) to tweak the track data as it was copied. I always wondered how they avoided legal action with that database which asked if the disk you were trying to copy was one of the hundred or so it knew how to "crack".

Reminds me of another piece of modern software still in use by a lot of people, which pulls disk metadata from an internet database for similar purposes.