Thoughts on that: (1) you'd need a way to visualize the magnetic fields, (2) the data is frequency modulated, (3) due to helical scan, the video field lines do not line up evenly one over the next as they did so nicely in the Laserdisc / CED (there'd be a skew).
So I don't want to say it's impossible, but I think it would require a lot more creativity.
I don't think it's inherently impossible, but Apple at least seems to do a really poor job at local cache management on iOS for Photos and Messages attachments. I am constantly amazed to find my non-tech-savvy relatives deleting stuff from their phones to free up local storage.
I suppose your `dd` implementation itself could do so, but I don't know why it would.
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