Running for Dummest question EVER

What's nano tolerance?

Isn't an analog recording high definition by default, since there is no sampling? It's all there on the record...to the limit of the medium's frequency response.

nanoscale tolerance if you prefer.

What I mean is whether an increased precision is the cutting of the record could lead to a higher definition reproduction. May be not!

Gotcha.

That's what MFSL Records were all about. Most information in a given space, like the Track Record.

Can a record be considered hi-def with such a limited freq response, high background noise and poor channel separation??? That's like saying black and white tv's are great because they do such a great job on grey-scale. IMO
Now if you're talking high quality (studio grade)analogue tape that's a different matter.