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Check your DVDs for disc rot — Warner Bros. says it’s replacing them
(www.theverge.com)
This is a most excellent place for technology news and articles.
How does one find the manufacturing date of the discs?
Cut it open and count the rings
If you turn the disc over, you can actually count the rings without needing to cut into it! This lets you skip having to glue the disc back together after checking the age.