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Re:An update of 455 new words by howeyc on Thursday October 28, 2021 @04:21PM (#29031397)
bit rot is your second paragraph. zfs has ways to handle bit rot in hard drives as an example.

Not sure there's a word defining what you mean. Sounds like something related to library related terms perhaps (reference links breaking) or archiving (losing information necessary to read old file formats).

Re:An update of 455 new words by __s on Thursday October 28, 2021 @05:33PM (#29032321)
The definition he's listing is the definition I've used for bit rot in the past, somewhat jokingly about bugs in old code