We lost drives all the time. In fact we moved so much data we needed checksums to avoid the 1e-13 undetected data errors. We seriously did do the calculations

We lost drives all the time. In fact we moved so much data we needed checksums to avoid the 1e-13 undetected data errors. We seriously did do the calculations (done by serious PhDs) and we seriously did not lose data. I’m sure you are imagining a system that doesn’t work. But that doesn’t mean only a raidlike setup can work. And by the way, could you explain how to calculate chance of data loss without taking recovery time into account?