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They say “billions of years” but that sounds like just the sort of thing a stray cosmic ray would ruin.
Maybe they’re planning on using a checksum for error correction like they do with RAID.
On that timescale, what are the odds that the checksum is still reliable?
Why would it be any different from the real data? Checksumming is basically just writing extra copies with math.
I'm asking why it would be more reliable if it has the same vulnerability to being corrupted.
Checksums are redundancy.
Right, but if the checksum is corrupted...
Yes Mr smarty pants, if all copies of data are corrupted the data is lost. More redundancy is more protection.