if each disk is very likely to have a bad block at any time, as seems more likely to be the case with today's larger disks, then you start to really need RAID, block checksumming, etc, simply to avoid losing data.
That risk would be the same if you had 10 disks, each with one tenth the data and one tenth the error rate.
I believe that people are storing more and more data on a given system, and the fact that p(error on this system) is going up should be of concern.
Now you're talking about error rate per system, not per disk.
And I'm not convinced that's important either. Spreading data out across 10 systems doesn't make the data loss hurt any less.
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