Geosbusters was a utility to crack Geos software. You could easily copy a Geos disk, but the first time you ran your original Geos disk if would write a two byte serial number on it. Next time you load the program if the serial number doesn’t match the disk would reboot. Read Lockpick #2 for tons more info on Geos protection. This ad was for version #3, but I have also seen a version #4. The disk also included a ‘Fast Copy’ program. When I ran it, it was the Fast Copy by Kracker Jax, see the photos below.