Outside of manufacturing defects you can expect HTL blu-rays to last for more than a hundred years when stored properly. Some estimates are as high as 300 years. Don't buy the cheap ones or store them outdoors and you'll be fine.
Some archival grade disc's are estimated to last 700 years or more and dont cost THAT much more.
DVD's and CDR'S used organic dies that broke down quickly. Blu-rays mostly use inorganic dies that last forever. Cheap LTH disc's being the exception.
MOST manufacturers like Verbatimm do not even produce the organic die LTH disc's anymore as people stopped buying them. There are still some floating around for sale, so avoid them.
Some archival grade disc's are estimated to last 700 years or more and dont cost THAT much more.
DVD's and CDR'S used organic dies that broke down quickly. Blu-rays mostly use inorganic dies that last forever. Cheap LTH disc's being the exception.
MOST manufacturers like Verbatimm do not even produce the organic die LTH disc's anymore as people stopped buying them. There are still some floating around for sale, so avoid them.