temporary-read-errors · shipping · also TRE, NAND temporary read errors

Temporary read errors (NAND)

Temporary read errors are a reversible excess of raw bit errors observed in initial reads of some 3D NAND blocks after an idle interval.

Zambelli et al. characterized commercial TLC 3D NAND using multiple blocks and dies of one product, with chip error correction disabled. The effect depended on the read sequence, temperature and delay between reads; it is distinct from accumulated read disturbance and early retention charge loss. [1]

Their system-level latency and soft-decoding results were simulated, not measured on a finished SSD. A better second read does not establish relocation, durable repair or safe data acceptance without ECC. Host caches and controller policy can hide the physical read sequence. [1] [2]

Relations

related

3d-nand, read-disturb, read-retry, read-reclaim, early-retention-loss, soft-decision-decoding

Limitations

• The study does not establish a universal retry interval, a fleet incidence rate or a unique microscopic cause. [1]

Citations

1. Zambelli et al. Temporary read errors in TLC 3D NAND after idle. JEDS 8 (2020), 99-104. DOI: 10.1109/JEDS.2020.2965648. (accessed 2026-10-18)
2. Hesela: first-read-after-idle measurement within SSD read-reclaim evidence (accessed 2026-10-18)

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