M-DISC

M-DISC (Millennial Disc) is a write-once optical disc technology introduced in 2009 by Millenniata, Inc. and available as DVD and Blu-ray discs.

== Overview == M-DISC's design is intended to provide archival media longevity. M-Disc claims that properly stored M-DISC DVD recordings will last up to 1000 years. The M-DISC DVD looks like a standard disc, except it is almost transparent with later DVD and BD-R M-Disks having standard and inkjet printable labels. thumb|317x317px|On the left is an 25GB BD-R M-disc written with information, on the right is an unwritten, blank 25GB BD-R M-disc. These discs have been discontinued, and the M-Disc currently available has a darker tint as shown in the below image. thumb|upright|On the top is a 25GB Verbatim BD-R M-DISC currently sold on the market (media ID: VERBAT-IMe, MABL-based), and on the bottom is a discontinued 25GB Verbatim BD-R M-DISC (media ID: MILLEN-MR1) available prior to 2022. Both discs have been written with information. The patents protecting the M-DISC technology assert that the data layer is a glassy carbon material that is substantially inert to oxidation and has a melting point of .