{
  "slug": "optical-archival",
  "term": "Optical archival storage",
  "aliases": [
    "write-once optical archive"
  ],
  "definition": "Long-retention storage using optical media such as professional disc systems designed for infrequent reads and decades-scale retention claims.",
  "note": "Optical archival storage writes digital data to reflective discs read by laser—commonly write-once (WORM) recordable media for compliance and long retention. Formats include professional archival discs (e.g., Sony Optical Disc Archive / Archival Disc lineage) and consumer-derived recordable CD/DVD/BD used in niche archive workflows. Strengths are removable WORM semantics and mature readers; weaknesses are fragmented format ecosystems, lower capacity per volume than modern LTO, and vendor-specific library robotics. Longevity claims are media- and storage-condition-dependent—cite manufacturer accelerated-test literature, not generic “1000-year” marketing without the test basis. Plan migrations when drive generations sunset.",
  "status": "limited",
  "advantages": [],
  "limitations": [],
  "related": [
    "glass-storage",
    "hot-warm-cold",
    "tape"
  ],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "citations": [
    {
      "id": "c1",
      "title": "Optical disc",
      "url": "https://en.wikipedia.org/wiki/Optical_disc",
      "accessed": "2026-03-26"
    },
    {
      "id": "n2",
      "title": "Sony — Optical Disc Archive / Archival Disc information",
      "url": "https://pro.sony/ue_US/products/optical-disc-archive",
      "accessed": "2026-10-07"
    },
    {
      "id": "n3",
      "title": "ISO/IEC — archival optical disc related standards catalog (search portal)",
      "url": "https://www.iso.org/search.html?q=archival%20optical%20disc",
      "accessed": "2026-10-07"
    }
  ]
}