LaaG wrote in post #9980267
Thats actually an old myth from the days of CDs. DVDs burn better and last longer at 8x or more. CDs are also more prone to UV and fungus degradation since the dye layer is unprotected, unlike DVDs where the dye is sandwiched between two polycarbonate UV protective disks.
I would burn on a good quality DVD like Verbatim or Taiyo Yuden.
Burnable CDs/DVDs can eventually ‘fade’, due to five things that effect the quality of CD media: Sealing method, reflective layer, organic dye makeup, where it was manufactured, and your storage practices. Like color films, keep all media out of direct sunlight, in a nice cool dry dark place, in acid-free plastic containers; this will maximize the lifetime of any media.
For CD media, Taiyo Yuden states Super Cyanine dye is chemically stable for at least 70 years, TDK states their metal-stabilized 'Cyanine' is also stable for 70 years, and Mitsubishi uses a Metal 'Azo' dye which they claim is stable for around 100 years. While azo dyes are chemically stable, the shelf life of media using Azo dyes typically does not exceed Super Cyanine and metal-stabilized Cyanine. A third dye for CD media is called 'phthalocyanine' dye, and this is typically marketed as more resistant to heat and UV radiation than Cyanine and Azo, but these are about the same tolerance.
DVDs also use organic dyes, but the manufacturers have intentionally kept dyes they use a secret. All blank DVDs are intentionally the same color Different dyes on CDs make blanks different colors, for DVDs it is not indicative of what dye, since they can be using different colored silver alloys and non-reactive additives in the dye.
Generally one should not use CD-RW, DVD-RW, or DVD+RW media in any form for permanent storage. DVD+R has superior error correction and burning control over DVD-R. The are debates about longevity of dye vs. phase change technology permanence.
I and many others have had burned DVDs sitting on shelves in the dark in acid free plastic containers, and had them fail within a few years. I even have a supplier-provided DVD with Photoshop LE which suddenly stopped being able to be loaded. I haven't had a burnable CD failure, in comparison.
Ultimately the issue is availability of devices to read digital data, and the Library of Congress has issues of data not accessible due to lack to device to read the media which was once recorded!