9InchRails writes "Yesterday, we discussed the 1 TB disks that will evidently be coming available. A main theme through the discussion is that optical media is not a good long term storage option, because the media goes bad. What are the alternatives? How can we store data in a retrievable fashion for twenty or fifty years? Do we just constantly migrate old data to newer mediums as they become availible? Suppose we're talking about 10 TB of data — which makes copying very difficult."