Disc rot: Difference between revisions

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[[wikipedia:Disc_rot|Disc rot]] is an event which happens when the materials that compose a compact disc (CD) or equivalent optical storage medium degrade. Often, disc rot occurs whenever companies are neglectful with how their discs are manufactured. Disc rot's existence has been aware of by manufacturers as early as 1988<ref>https://www.newspapers.com/article/st-louis-post-dispatch-cd-corrosion/8722352/ <!-- I would appreciate it if someone could find a version that offers a text transcription! --></ref> and continues to prevail to this day.<ref name=":0">https://www.vice.com/en/article/the-hidden-phenomenon-that-could-ruin-your-old-discs/</ref>

Disc rot is not directly intentional from manufacturers, and is considered a case of neglect from manufacturers by most communities. Despite this, there are some formats, such as [[DVD-D]], which are intentionally manufactured for the [[Planned obsolescence|purpose of degradation]], which exhibit traits that can be related to disc rot.   

Disc rot occurs in various formats, and has various causes depending on how it was manufactured and stored. This is not an exhaustive list of causes as new methods for the cause of disc rot continue to be found.<!-- I am working with limited sources here, this section REALLY needs more data to work with! -->

Often seen on aluminum-based discs, if they are exposed to the atmosphere for a prolonged period of time, the disc can begin to rot. This can additionally happen despite the media being factory-sealed.<ref name=":1">http://www.classical.net/music/guide/society/krs/excerpt3.html</ref> Lacquer or plastic layers are often used to block oxidation, but other factors some of which are listed here can damage this protective layer.

Water is known to carry ions that can eat away at both protective layers and aluminum, and humid environments can foster disc rot,<ref name=":1" /> especially if the location a disc was manufactured at is humid, which can negate any consumer's attempts to slow down or halt any form of rot. Humid environments are also hotbeds for mold, which protective layers and even the reflective layer can act as a substrate for spores to grow into colonies.

Heat has the capability to distort protective plastic layers, or melt layers of lacquer on discs. Any damage to the protective layer risks exposure to the elements.

More specifically ultraviolet (UV) light can both impart heat and also degrade the reflective layer on a disc.  

Discs are made up of various chemicals meant to protect it, however, some chemicals can be affected by their environment and degrade the disc. An example of this was when discs manufactured by Phillip's were distributed in paper sleeves which had trace elements of sulfur,<!-- Is it sulfur or sulphur???? --> which reacted with the protective layer on the disc and caused bronzing to occur.<ref>https://web.archive.org/web/20160801032047/https://www.hyperion-records.co.uk/pages/bronzed.asp</ref>

The appearance of disc rot comes in different formats, such as:

Small holes on the disc that can sacrifice the integrity of the data on the disc,<ref>http://news.bbc.co.uk/1/hi/entertainment/music/3940669.stm</ref><ref>https://tedium.co/2017/02/02/disc-rot-phenomenon/</ref> these can be made more visible if you shine a strong light on your disc.

Via [[wikipedia:Compact_disc_bronzing|Wikipedia]]:<blockquote>Affected discs show an uneven brownish discoloring that usually starts at the edge of the disc and slowly works its way toward the center. The top or label layer is affected before the bottom layer. The disc becomes progressively darker over time; tracks at the end of the disc (near the outer edge) show an increasing number of disc-read errors before becoming unplayable.</blockquote>

Warped or other forms of distortion can be used as a method to track disc rot, however this can only be tracked within discs intended for playing audio, such as audiobooks or music discs.

==Major incidents==

Consumers have reported that the discs that they purchased for their Wii U consoles are experiencing rot,<ref>https://forums.atariage.com/topic/306522-are-all-wii-u-physical-discs-doomed/</ref><ref>https://www.youtube.com/watch?v=MlVrhF7DYbg</ref> and in some scenarios, degrading on a large scale in individual collections.<ref>https://www.reddit.com/r/wiiu/comments/15t0i84/all_these_games_in_my_collection_are_dead_from/</ref><ref>https://gbatemp.net/threads/wii-u-discs-have-a-high-failure-rate.628470/</ref> Often, the degradation is described as pinholes scattered across the disc. [Example picture to be added]<!-- Read this post, and decide which pic is best to use as an example in this section!  

https://www.reddit.com/r/wiiu/comments/15tha7u/disc_rotspots_is_real/ -->

It has been reported that DVDs manufactured from 2006-08 have been rotting away,<ref>https://www.joblo.com/warner-bros-dvds-dont-work/</ref> especially ones stored in their own cases.<ref>https://arstechnica.com/gadgets/2025/03/they-curdle-like-milk-wb-dvds-from-2006-2008-are-rotting-away-in-their-cases/</ref> Unlike most distributors, Warner has been offering replacements for these degraded discs for consumers.<ref>https://www.avclub.com/warner-bros-replacing-disc-rot-dvd</ref> <!-- I wonder if they would replace UMDs... -->

To be written, primary source: [https://www.rfgeneration.com/news/Disc-Rot/An-important-note-to-Video-Game-Sellers-and-Buyers-1337.php <nowiki>[1]</nowiki>]<!-- Intentionally not a reference since nothing is written yet! -->

[[DVD-D]]<ref>https://en.wikipedia.org/wiki/DVD-D</ref>

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[[Category:Common terms]]