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Error correction code (ECC) checks read or transmitted data for errors and corrects them as soon as they are found. ECC is similar to parity checking except that it corrects errors immediately upon detection. ECC is becoming more common in the field of data storage and network transmission hardware, especially with the increase of data rates and corresponding errors.
Error correction code is applied to data storage via the following steps:
Data is not verified during its storage period, but is tested for errors when it is requested. If required, the error correction phase follows detection. Frequent recurring errors at the same storage address indicate a permanent hardware error. In this case, the system sends the user a message, which is logged to record the error location(s).