M discs were made, quite possibly to meet the Mormon need of post Armageddon lineage documentation, to last at a minimum of 1000 years in reasonable condition. They are just special, expensive CDRs that use a different dye system that won't break down in 4 years.
My optical disk drive was $17 and has M disc writing compatibility, and my understanding is they are meant to be read by any CD reader.
My optical disk drive was $17 and has M disc writing compatibility, and my understanding is they are meant to be read by any CD reader.