Before revision: Optical media - CD, DVD Write-once optical media, such as CD-Rs and DVD-Rs, contain an organic dye that distinguishes data reading from data writing based on the dye's transparency along the disk.Library of Congress, "NIST/LC: Optical Disc Longevity Study," URL Conventional CDs and DVDs have finite shelf-life due to natural degradation of the dye; the newer M-DISC uses different technology to produce DVDs with a claimed lifespan of up to 1000 years .
After revision: Optical media - CD, DVD Write-once optical media, such as CD-Rs and DVD-Rs, contain an organic dye that distinguishes data reading from data writing based on the dye's transparency along the disk.Library of Congress, "NIST/LC: Optical Disc Longevity Study," URL Conventional CDs and DVDs have finite shelf-life due to natural degradation of the dye; the newer M-DISC uses in-organic meterial technology to produce moluded DVDs and Blu-Rays (upto 3 layer 100GB BDXL) with a claimed lifespan of , Blu-ray, M-Disktypically