They do https://www.sony.com/electronics/support/articles/00009195 >>A typical DVD disc has an estimated life expectancy of anywhere from **30 to 100 years** when properly stored and handled. How the disc is stored and handled will determine the longevity of the media. To obtain the maximum life expectancy, follow these guidelines... https://www.loc.gov/preservation/scientists/projects/cd-r_dvd-r_rw_longevity.html >>Optical discs are composed of layers, based on the original CD-ROM construction, which consists of a polycarbonate substrate that has been stamped with data from a master, a metal reflective layer, and a protective top coating. Recordable formats, "R" media, are a type of Write Once, Read Many (WORM) technology. These media use a photosensitive organic dye as the data layer rather than stamping of the polycarbonate. Rewritable formats, "RW" media, use a phase-changing metal-alloy film sandwiched between two dielectric layers as the data layer. The chemical composition of these layers varies depending on when and where the disc was manufactured. Aging, storage environment, and handling can adversely affect disc materials, which can lead to loss of data. Research has shown that recordable media tend to degrade faster than ROM media The Library of Congress has long been committed to gaining an understanding of the longevity of optical storage media...