You are mistaken here. Tapes, unless stored with extreme precision, usually last ~20 years safely. They tend to have a longer life, but not without a high risk

You are mistaken here. Tapes, unless stored with extreme precision, usually last ~20 years safely. They tend to have a longer life, but not without a high risk of deterioration. In my experience, written CD and DVD only lasts for <10 years, if you're lucky. However studies show you can get 30-45, even 45+ years out of them. Most Blu-Ray expectancy exceeds this due to the different non organic dye based layering and coating. The one mentioned above, M-Disc was something developed for DARPA and supposed to last 1000 years in theory. See: http://www.mdisc.com/ http://www.mdisc.com/ http://loc.gov/preservation/resources/rt/NIST_LC_OpticalDiscLongevity.pdf http://loc.gov/preservation/resources/rt/NIST_LC_OpticalDisc... http://www.zdnet.com/article/torture-testing-the-1000-year-dvd/ http://www.zdnet.com/article/torture-testing-the-1000-year-d...