Rather than a checksum, I think we're talking about something like a recovery record[1] or some kind of error correcting code, which is slightly different. [1

Rather than a checksum, I think we're talking about something like a recovery record[1] or some kind of error correcting code, which is slightly different. [1] like these - https://en.wikipedia.org/wiki/Comparison_of_archive_formats#Recovery_record https://en.wikipedia.org/wiki/Comparison_of_archive_formats#...