That link (or rather the fact that one of the cheeses they make is Dry Jack) reminds me of the one time I tried super aged Dry Jack (different brand). I'm not sure if calling it the hardest cheese I ever had is accurate, since hard things can still be brittle (a diamond or a sapphire is quite hard, but smashing one to bits is not at all difficult. But I can say it was the TOUGEST cheese I ever encountered. It was like wood Slicing each edible piece off required getting out the BIG cleaver (the one we normally use for heavy chopping score a groove into the cheese deep enough to keep it stuck to the blade, then hit the blade against a stone cutting board until the piece broke off then do it again and again until each piece was bite sized. Took forever. Even that goat cheese I liked (the one that was the size and shape of a discman and as hard as a discus) was easier (at least that one would fracture after a few cuts........