I would like to see approaches to recovering data from fragile disks by placing the inner disk on a flat surface and using some kind of imaging technology to measure the magnetic fields - perhaps an electron microscope could do the job at low enough field strengths?

Using this I imagine it might be possible to not only read the disk data, but perhaps even previous versions of data that has been overwritten.

Magnetic field cameras exist:

https://matesy.de/en/products/cmos-magview

https://en.wikipedia.org/wiki/File:Visualization_of_magnetic...

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