> Anyway, if "They" care about their data , "They" use checksumming for storing 
> their data on disk, do "They" ? ;) <snip> silent bitrot on disks _does_ happen

I totally agree. Storage devices fail and if you need to know if the data is 
the same then a checksum is your best bet. If you want to do your best to 
mitigate this issue to the best of your ability, then there are some good file 
system choices which may be made prior to the spinning platters disks having 
bad blocks or the flash memory failing.

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