Has anyone had an otherwise undamaged DVD fail on them? By now there should be plenty of nearly 25 year old dvds out there that have done nothing but sit in a case on a shelf since 1999.
I have not been keeping the DVDs in a controlled environment. They have been in a garage in a high humidity region.
I think you could keep them indefinitely in a humidity controlled environment but for the average user they will corrode just like old mirrors do.
For factory printed discs, bit rot caused data loss in 8 to 10% of the discs. 2 to 3% were a total loss. Those loses were closer to 20-25% for burnable media.
90%+ lived a very comfortable life, climate controlled and protected from UV.
Burnt CD-R and DVD-R definitely had a reduced life. CD-RW even worse
I have also had them come right out of the box and have errors. No visible issues. But the thing just will not read in particular places on the movie.