The combination of high temperature and UV light may further accelerate the aging process. The combination of high temperatures and high relative humidity will also most likely accelerate the aging process, just as it does with the organic dye used in R discs.
No lab test results are yet available on the effects of these environmental conditions on RW or RAM discs. The data on the phase-changing metal alloy film layer can be erased and rewritten to a limited number of times about 1, times for RW discs and about , times for RAM discs. This rewriting does, however, affect disc life expectancy; RW or RAM discs archived after the first recording should have a longer life expectancy than those that have undergone several erase-recording cycles.
Add to that multiple rewrites, and the life expectancy can be even less. Just as the life expectancy of the disc varies with rewriting, so, too, does the security of the information itself. Information on R discs is more secure precisely because it cannot be changed or rewritten.
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Factors that affect disc life expectancy include the following: manufacturing quality condition of the disc before recording quality of the disc recording handling and maintenance environmental conditions As noted previously, the three basic types of CD and DVD discs-ROM, R, and RW and RAM-each use a different data layer material molded aluminum, organic dye, or phase-changing film, respectively.
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Thank you for visiting! Follow Film Stories on Twitter here , and on Facebook here. Toggle navigation. How long will our DVDs and Blu-rays last? Tags: blu-ray , DVD , physical media. When exposed to air, aluminum oxidizes, which naturally happens around the edges of the CD.
However, degradation of the reflective layer is not the only cause of disc rot , the chemical or physical deterioration of data which results in information becoming unreadable. These underlying causes of disc rot are manifold and can include any of the following:. This manifests as a brown discoloration or "mold" starting at the edge of the disc and working its way towards the middle. There's some disagreement over what causes CD bronzing, but it's most likely to be either the lacquer used to coat discs or the silver used instead of aluminum reacting with the sulfur found in sleeves and accompanying booklets.
This forms the brown silver sulfate. If you see light shining through tiny holes when you hold a disc against light, then the reflective layer has started to disintegrate. Also check your CDs for discoloring, especially around the edges. See whether the different layers are still tightly together or have started to de-laminate. You might see small scratches too when inspected under the light. Most of the time, these won't have too much of an adverse effect on the data, but deeper marks can.
Little scratches are a warning sign that the disc isn't being treated properly, so check whether it's staying in its holder properly, or if there's anything else affecting the physical unit. Pay attention to any parts that skip or jump. Be careful with doing this: if it gets too hot and overloads the system, you can cause more damage, so be patient and stop the disc as soon as a problem arises.
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