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Table 6 Extra storage rates of different ECC schemes for three block sizes

From: Improving reliability of non-volatile memory technologies through circuit level techniques and error control coding

  BCH(78,64)*8+ even parity check BCH(78,64)*16+ even parity check BCH(144,128)*8+ even parity check BCH(144,128)*16+ even parity check BCH(274,256)*8+ even parity check
512 bits 27%     
1024 bits   22.8% 21%   
2048 bits     16.4% 17%