{
  "slug": "backblaze-hdd-afr",
  "title": "Backblaze Q2 2026 hard drive AFR by model",
  "kind": "dataset",
  "summary": "Backblaze's published Q2 2026 quarterly hard-drive annualized failure rate was 1.73% (vendor claim): 1,498 failures across 31,553,350 drive days on 354,415 drives. This download is the 31-model table for April 1 through June 30, 2026 inclusive (drive count above 100 and drive days above 10,000), not the daily SMART archive.",
  "license": "Derivative table transcribed from Backblaze Drive Stats for Q2 2026. Cite Backblaze if you use it. You are solely responsible for how you use it. Backblaze's dataset page allows sale of derivative works and forbids selling the Drive Stats data itself. The Q2 2026 report restates citation, sole responsibility, and the ban on selling the data, and does not restate the derivative-works permission. This CSV is not Backblaze's daily SMART archive, and that archive is not for sale.",
  "licenseUrl": "https://www.backblaze.com/cloud-storage/resources/hard-drive-test-data",
  "sourceUrl": "https://www.backblaze.com/blog/backblaze-drive-stats-for-q2-2026/",
  "accessed": "2026-10-07",
  "rowCount": 31,
  "columns": [
    {
      "name": "mfg",
      "type": "string",
      "description": "Manufacturer label as published by Backblaze: HGST, Seagate, Toshiba, or WDC."
    },
    {
      "name": "model",
      "type": "string",
      "description": "Drive model identifier as published."
    },
    {
      "name": "size_tb",
      "type": "integer",
      "description": "Nominal capacity in terabytes as published."
    },
    {
      "name": "drive_count",
      "type": "integer",
      "description": "Drives of this model in the quarterly cohort."
    },
    {
      "name": "avg_age_months",
      "type": "number",
      "description": "Average age in months as published. Not an input to the AFR column."
    },
    {
      "name": "drive_days",
      "type": "integer",
      "description": "Drive-days observed for this model in the quarter."
    },
    {
      "name": "failures",
      "type": "integer",
      "description": "Drives that failed in the quarter, as published."
    },
    {
      "name": "afr_percent",
      "type": "number",
      "description": "Annualized failure rate in percent, copied as published rather than refit."
    }
  ],
  "downloadPath": "/data/datasets/backblaze-hdd-afr.csv",
  "citations": [
    {
      "id": "bb-q2-2026-report",
      "title": "Backblaze Drive Stats for Q2 2026",
      "url": "https://www.backblaze.com/blog/backblaze-drive-stats-for-q2-2026/",
      "accessed": "2026-10-07"
    },
    {
      "id": "bb-drive-stats-data",
      "title": "Hard Drive Reliability & Test Data",
      "url": "https://www.backblaze.com/cloud-storage/resources/hard-drive-test-data",
      "accessed": "2026-10-07"
    },
    {
      "id": "bb-q2-2026-press",
      "title": "Backblaze Publishes Q2 2026 Drive Stats: Quarterly Failure Rate Rises to 1.73%",
      "url": "https://ir.backblaze.com/news/news-details/2026/Backblaze-Publishes-Q2-2026-Drive-Stats-Quarterly-Failure-Rate-Rises-to-1-73/default.aspx",
      "accessed": "2026-10-07"
    },
    {
      "id": "bb-q2-2026-zip",
      "title": "Drive Stats daily SMART archive for 2026 Q2 (data_Q2_2026.zip)",
      "url": "https://f001.backblazeb2.com/file/Backblaze-Hard-Drive-Data/data_Q2_2026.zip",
      "accessed": "2026-10-07"
    }
  ]
}