{
  "slug": "backblaze-2026-afr-by-vendor-and-capacity",
  "title": "Backblaze pooled AFR by manufacturer and capacity, Q1 versus Q2 2026",
  "kind": "dataset",
  "summary": "Pooled annualized failure rates for Backblaze's published Q1 2026 (January 1 to March 31) and Q2 2026 (April 1 to June 30) model tables, grouped by manufacturer (4 groups) and nominal capacity (10 groups). Pooled over 33 model rows: 30,203,180 drive days and 1,030 failures in Q1, 31,553,350 drive days and 1,498 failures in Q2. Pooled AFR rose in all four manufacturer groups and in 8 of 9 capacity groups present in both quarters. Vendor claim data from Backblaze's own fleet; the grouping and pooling are computed here.",
  "license": "Derivative table transcribed from Backblaze Drive Stats reports for Q1 2026 and 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. This CSV is a small derived aggregate of that comparison, 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": "2026-10-10",
  "rowCount": 14,
  "columns": [
    {
      "name": "group_type",
      "type": "string",
      "description": "Grouping used: manufacturer or capacity_tb."
    },
    {
      "name": "group",
      "type": "string",
      "description": "Manufacturer label as published (HGST, Seagate, Toshiba, WDC) or nominal capacity in terabytes."
    },
    {
      "name": "q1_models",
      "type": "integer",
      "description": "Number of model rows in the group in the Q1 2026 (January 1 to March 31) table. Empty if the group has no rows that quarter."
    },
    {
      "name": "q1_drive_count",
      "type": "integer",
      "description": "Sum of the published quarter-end drive counts of those models, Q1 2026 (January 1 to March 31)."
    },
    {
      "name": "q1_drive_days",
      "type": "integer",
      "description": "Sum of published drive days, Q1 2026 (January 1 to March 31)."
    },
    {
      "name": "q1_failures",
      "type": "integer",
      "description": "Sum of published failures, Q1 2026 (January 1 to March 31)."
    },
    {
      "name": "q1_afr_percent",
      "type": "number",
      "description": "Pooled AFR in percent, computed as failures / drive days * 365 * 100 and rounded to two decimals, Q1 2026 (January 1 to March 31). Not a published figure."
    },
    {
      "name": "q2_models",
      "type": "integer",
      "description": "Number of model rows in the group in the Q2 2026 (April 1 to June 30) table. Empty if the group has no rows that quarter."
    },
    {
      "name": "q2_drive_count",
      "type": "integer",
      "description": "Sum of the published quarter-end drive counts of those models, Q2 2026 (April 1 to June 30)."
    },
    {
      "name": "q2_drive_days",
      "type": "integer",
      "description": "Sum of published drive days, Q2 2026 (April 1 to June 30)."
    },
    {
      "name": "q2_failures",
      "type": "integer",
      "description": "Sum of published failures, Q2 2026 (April 1 to June 30)."
    },
    {
      "name": "q2_afr_percent",
      "type": "number",
      "description": "Pooled AFR in percent, computed as failures / drive days * 365 * 100 and rounded to two decimals, Q2 2026 (April 1 to June 30). Not a published figure."
    }
  ],
  "downloadPath": "/data/datasets/backblaze-2026-afr-by-vendor-and-capacity.csv",
  "chartPath": "/data/datasets/backblaze-2026-afr-by-vendor-and-capacity.svg",
  "citations": [
    {
      "id": "bb-q1-2026-report",
      "title": "Backblaze Drive Stats for Q1 2026",
      "url": "https://www.backblaze.com/blog/backblaze-drive-stats-for-q1-2026/",
      "accessed": "2026-10-09"
    },
    {
      "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": "2026-10-09"
    },
    {
      "id": "bb-drive-stats-data",
      "title": "Hard Drive Reliability & Test Data",
      "url": "https://www.backblaze.com/cloud-storage/resources/hard-drive-test-data",
      "accessed": "2026-10-09"
    },
    {
      "id": "hesela-afr-shift",
      "title": "Backblaze drive model AFR, Q1 versus Q2 2026 (model rows used here)",
      "url": "https://hesela.dev/datasets/backblaze-q1-q2-2026-afr-shift",
      "accessed": "2026-10-10"
    }
  ]
}