{
  "slug": "read-reclaim",
  "term": "Read reclaim",
  "aliases": [
    "NAND read reclaim",
    "read-disturb reclaim"
  ],
  "definition": "Read reclaim relocates valid NAND data to fresh pages to limit accumulated read-disturb errors.",
  "note": "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.",
  "status": "shipping",
  "advantages": [],
  "limitations": [
    {
      "text": "Wordline-selective reclaim in STRAW is a research design evaluated using simulation, not a guarantee about commercial firmware.",
      "citationIds": [
        "straw"
      ]
    }
  ],
  "related": [
    "read-disturb",
    "read-retry",
    "garbage-collection",
    "write-amplification",
    "ftl"
  ],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-12",
  "citations": [
    {
      "id": "straw",
      "title": "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.",
      "url": "https://arxiv.org/html/2501.02517v1",
      "accessed": "2026-10-12"
    },
    {
      "id": "park",
      "title": "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.",
      "url": "https://arxiv.org/html/2608.14073v1",
      "accessed": "2026-10-12"
    },
    {
      "id": "hesela-reclaim",
      "title": "Hesela: SSD read reclaim and read-only accounting",
      "url": "https://hesela.com/analyses/ssd-read-reclaim-hidden-writes/",
      "accessed": "2026-10-12"
    }
  ]
}