{
  "slug": "optical-disc-lifetime-estimate",
  "term": "Optical-disc lifetime estimate",
  "aliases": [
    "standardized optical life expectancy"
  ],
  "definition": "An optical-disc lifetime estimate predicts time to a defined error threshold for a stated population percentile and storage environment under an aging model.",
  "note": "The NIST/LC 2007 method combines accelerated temperature/humidity tests, an Eyring model and log-normal lifetimes at 25 degrees Celsius and 50% relative humidity [nist2007]. Its 95% survival target differs from its 95% confidence calculation. The report concerns 2005 products and selected test bands; it is not a warranty, a complete-disc readability certificate or a modern-media forecast.",
  "status": "unknown",
  "advantages": [],
  "limitations": [],
  "related": [
    "optical-archival",
    "optical-bler"
  ],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-15",
  "citations": [
    {
      "id": "nist2007",
      "title": "NIST/Library of Congress. Optical Disc Longevity Study, final report (September 2007), sections 1-5 and Appendix I.",
      "url": "https://www.loc.gov/preservation/resources/rt/NIST_LC_OpticalDiscLongevity.pdf",
      "accessed": "2026-10-15"
    },
    {
      "id": "analysis",
      "title": "Hesela: optical-disc lifetime estimates, error thresholds and uncertainty",
      "url": "https://hesela.com/analyses/optical-disc-lifetime-estimates/",
      "accessed": "2026-10-15"
    }
  ]
}