"dale" wrote:

achivial grade means that they have a longer shelf life after data is
committed to disc.
closer tolerances in maufacture and types of dye and reflective surface
used are more costly.
archivist prefferred the kodiak, sadly they quit making them.

They made disks only for a few years, so how much was the "longer shelf
life"? It was commonplace unsupported marketing hype.

The fragility of their sticky-coated metal tops was a hazard. It nearly
liquified in humid weather. After losing a few, I threw out dozens of
unused disks. Good riddance.