alt Hacker News> Also: I don't have a bd/dvd player in my house today
You have just stumbled on the inherent problem with any archival media.
You really think you will have a working tape drive after 40 years?
Hell, in my experience tape drives are mechanically complex and full of super thin plastic wear surfaces. Do you really expect to have a working tape drive in 10 years?
As far as I can tell there is no good way to do long term static digital archives, And in the absence of that you have to depend on dynamic archives, transfer to new media every 5 years.
I think to have realistic long term static archives the best method is to only depend on the mark 1 eyeball. find your 100 best pictures, and print them out. identify important data and print it out. Stuff you want to leave to future generations, make sure it is in a form they can read.
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For LTO tapes? Yes they will be available since the format is so common.
I do think LTO is a common enough format, and explicitly designed to be backwards-compatible, that it is very likely to be around in 10 years. The companies that rely on it wouldn't invest in it if they didn't think the hardware would be available. 40 years, harder to say, but as someone who owns a fair bit of working tape equipment (cassette, VHS, DV) that is almost all 25+ years old, i wouldn't think it'd be impossible.
That said, i imagine optical drives will be much the same.