Okay, I found this resource image...

https://www.deviantart.com/llexandro/art/Sci-Fi-Texture-246-777543120

That I would like apply to a surface, the final effect looking like a full disc.  I would think there's a way to link some nodes in the "Material Room" to create this effect, but I can't solve the formula.  True, I could also do this in an image editor like PaintShop Pro, but the final image would be 8000 by 8000 pixels unless i shrink it and I'd rather not lose the detail.

Any clever "wizards" willing to share the secret?

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Tempt the Hand of Fate and it'll give you the "finger"!