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As technology continues to scale down, NAND Flash memory has been increasingly relying on error-correction codes (ECCs) to ensure the overall data storage integrity. Although advanced ECCs such as low-density parity-check (LDPC) codes can provide significantly stronger error-correction capability over BCH codes being used in current practice, their decoding requires soft-decision log-likelihood ratio...
This paper applies information theory to formulate and estimate the NAND flash memory storage efficiency bound, and shows a big gap between the theoretical bound and what is achievable today. We further present two techniques to reduce the gap and demonstrate their promising potential using 2 bits/cell NAND flash memories as a test vehicle.
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