idea for a universal disk interface

[Fred Cisin]

On Thu, 14 Apr 2022, John Foust via cctalk wrote:
> Magnetic visualizers also discussed here:
> http://qicreader.blogspot.com/p/track-visualization.html

Thank you.

That is what I was looking for.
It doesn't imply current existence of anything already coupled with a 
digital camera, nor particularly suitable for an X/Y positioning system 
(such as a repurposed plodd^H^Htter) for scanning.

Certainly possible.