Before revision: As of the 2020s, there are only 2 licensed manufacturers' M-Discs: Ritek sold under the Ritek and M-DISC brands and Verbatim produces co-branded discs, marketed as the "Verbatim M-DISC".
After revision: As of the 2020s, there are only 2 licensed manufacturers' M-Discs: Ritek sold under the Ritek and M-DISC brands , and Verbatim with co-branded discs, marketed as the "Verbatim M-DISC".