The document discusses M-Disc, a new type of optical disc created from a material similar to rock that is much more durable than traditional discs like DVDs and Blu-rays. M-Discs are designed to last over 1,000 years and are not easily erased like other discs. They work on current DVD and Blu-ray drives but require a more powerful laser for writing. The material makes scratches and fingerprints impossible and data cannot be erased from the solid recording layer. M-Discs cost around $3 each and have storage capacities similar to DVDs currently but may increase to Blu-ray levels.