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Seagate ST24000NM002H 24 TB failure rate and reliability
D Grade D: Below average
Backblaze logged 12,353 drive-years on the Seagate ST24000NM002H from Q1 2023 to Q3 2026, with 9,433 in service at the end of that period. In that time 415 drives failed, an annualised failure rate of 3.36%.
That is 121% higher than the 1.52% average across every drive in the same data, which earns it grade D (below average).
Among the 2 graded 24 TB hard drives it ranks 2 of 2 for reliability.
Failures have risen: 3.78% over the latest 4 quarters against 2.31% before. Rising rates often mean a model is ageing.
- Failure rate / year
- 3.36%
- Average, all drives
- 1.52%
- Drives in use
- 9,433
- Drive-years
- 12,353
- Failures
- 415
- Capacity
- 24 TB
- Type
- HDD
- Model number
- ST24000NM002H
Failure rate by quarter
| Quarter | Drive-days | Failures | Failure rate / year |
|---|---|---|---|
| Q4 2024 | 18,000 | 0 | 0.00% |
| Q1 2025 | 230,406 | 7 | 1.11% |
| Q2 2025 | 432,651 | 28 | 2.36% |
| Q3 2025 | 601,539 | 46 | 2.79% |
| Q4 2025 | 676,414 | 65 | 3.51% |
| Q1 2026 | 820,090 | 74 | 3.29% |
| Q2 2026 | 861,587 | 82 | 3.47% |
| Q3 2026 | 868,152 | 113 | 4.75% |
Single quarters with few drive-days swing widely; the overall figure above is the dependable one.
All 24 TB hard drives compared
| Grade | Model | Type | Size | Failure rate / year | Drives in use | Drive-years | Failures |
|---|---|---|---|---|---|---|---|
| A | Toshiba MG11ACA24TE | HDD | 24 TB | 0.52% | 16,556 | 7,816 | 41 |
| D | Seagate ST24000NM002H | HDD | 24 TB | 3.36% | 9,433 | 12,353 | 415 |