These special (and generally more expensive) memory chips have a built-in controller that includes a parity code known as a Hamming Code. If one of the bits goes bad, it can correct it and report the correct data back to the host computer. This works by employing an algorithm that writes data in a way that allows the formula to match pieces of data.
Hamming Codes can successfully check for data consistency with a minimal amount of redundant data, which helps in computer RAM. However, this method isn’t effective in situations where error rates are very high.
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