I'm not exactly sure how this happened, but It might have something to do with mold. It was a very humid summetr, sometimes you start pulling stuff out of a box that's been sitting and find stuff has been growing! Anyway, the actual screen printed (?) coating has deteriorated some. The disk was unreadable prior to that, I had planned to gather up all similar disks and clean them, hoping some could be salvaged. Does the parial erasure of the top side coating mean it's hopeless?