read-disturb-recovery · research · also RDR, read-disturb-oriented error recovery

Read Disturb Recovery (RDR)

Read Disturb Recovery is a research technique that uses cell responses to additional disturbance to infer bit values before another ECC attempt.

Related Observatory article: Read Disturb Recovery (RDR) on hesela.com

Unlike reclaim, RDR targets already unreadable data rather than preventive relocation [1]. Its probabilistic guesses can introduce errors. It is distinct from simply trying another sensing reference or issuing repeated host reads. The companion analysis explains why a lower aggregate error count is not a per-codeword recovery guarantee [2].

Relations

related

Read disturb, Read reclaim, NAND read-retry, LDPC (NAND ECC)

Limitations

• Planar MLC evidence does not establish effectiveness on arbitrary modern SSDs. [1]

Citations

1. Cai et al. Read Disturb Errors in MLC NAND Flash Memory: Characterization, Mitigation, and Recovery. DSN 2015, sections 5.2-5.4. DOI: 10.1109/DSN.2015.49. (accessed 2026-10-20)
2. Hesela: Read Disturb Recovery and codeword correction-radius counterexample (accessed 2026-10-20)

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