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LDPC-in-SSD: Making Advanced Error Correction Codes Work Effectively in Solid State Drives

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Executive Summary

Conventional Error Correction Codes (ECCs), such as the commonly used BCH code, have become increasingly inadequate for Solid State Drives (SSDs) as the capacity of NAND flash memory continues to increase and its reliability continues to degrade. It is highly desirable to deploy a much more powerful ECC, such as Low-density Parity-Check (LDPC) code, to significantly improve the reliability of SSDs. Although LDPC code has had its success in commercial hard disk drives, to fully exploit its error correction capability in SSDs demands unconventional fine-grained flash memory sensing, leading to an increased memory read latency.

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