On 11/2/21 12:13 PM, dwight via cctalk wrote: > The trickiest protection I've seen is where there is a hole punched > through the disk on one track. The idea is that the protected program > writes to that track and expects to see a failure to read that > track.
There were more floppy protection schemes than you could shake a stick at: https://diskpreservation.com/dp.php?pg=protection The Apple II ones were interestingly devious, particularly the "spiral track" one. At any rate, lots of stories there, both in creation and defeating. --Chuck