hesela.devRead reclaim
Read reclaim relocates valid NAND data to fresh pages to limit accumulated read-disturb errors.
It differs from read retry, which adjusts sensing, and from space-driven garbage collection. Relocation can add internal programming during host read-only intervals. Thresholds and migration granularity depend on the design; a universal host-read limit cannot be inferred.
Relations
- related
- read-disturb, read-retry, garbage-collection, write-amplification, ftl
Limitations
- Wordline-selective reclaim in STRAW is a research design evaluated using simulation, not a guarantee about commercial firmware. [1]
Citations
- Myoungjun Chun, Jaeyong Lee, Inhyuk Choi, Jisung Park, Myungsuk Kim and Jihong Kim. STRAW: A Stress-Aware WL-Based Read Reclaim Technique for High-Density NAND Flash-Based SSDs. Author manuscript arXiv:2501.02517v1, 5 January 2025, sections II-IV.
- Yonggon Park, Hyunuk Cho, Onur Mutlu, Sungjin Lee and Jisung Park. Experimental Study on System-Level Performance Impact of Read Disturbance in Modern SSDs. POMACS 2026, DOI 10.1145/3788092; author manuscript arXiv:2608.14073v1, sections 2.3, 4 and 5.
- Hesela: SSD read reclaim and read-only accounting