I don't know. They were only consumer-grade disks. It hardly matters because I don't own any machine with a working 5.25" drive anyway. Some of my old files I d

I don't know. They were only consumer-grade disks. It hardly matters because I don't own any machine with a working 5.25" drive anyway. Some of my old files I did copy onto CD-Rs in the early 2000s -- I wonder if those are still readable? The point is that it's actually fairly hard to beat acid-free paper for archival storage.