DIGITAL DATA STORAGE ERROR DETECTING AND CORRECTING SYSTEM AND METHOD

摘要

System for detecting and correcting data bit errors caused by alpha particle impingement into high density storage units. The data word is read into and out of a high density storage unit and generated check bits are stored in low density storage immune to alpha particle radiation. Data bits and check bits, addressed in parallel are read out to error detector and corrector to determine the existence of an error only in a data bit and correct the state of the erroneous bit. The number of check bits and required parity checking circuitry is reduced since no error checking of check bits, presumed to always be correct because of the use of low density storage occurs.