> I think it was Dysan that first showed up with reinforcing ring kits

Probably, "Grabettes."

> Then why was is it that DD media bought well after HD media was available, in 
> use, and the norm still had the reinforced ring? Tradition?

You might be putting it in an old drive. It was also available without, I had 
several thousand without reinforcements from Verbatim, bought in bulk bags.

Thanks,
Jonathan

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