Please someone correct me if I'm wrong, but as far as I can remember memory with extra capacity for error detection used to be a rather common thing on early PC

Please someone correct me if I'm wrong, but as far as I can remember memory with extra capacity for error detection used to be a rather common thing on early PCs. That really only changed a couple of decades in, in order to be able to offer lower prices to home users who didn't know or care about the difference. Probably about the time, or earlier, when with some hard disk manufacturers megabytes suddenly shrunk to 10^6 bytes (before kibibytes or mebibytes where a thing, btw).