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Seagate ST8000NM0055 8 TB failure rate and reliability
D Grade D: Below average
Backblaze logged 50,867 drive-years on the Seagate ST8000NM0055 from Q1 2023 to Q3 2026, with 12,700 in service at the end of that period. In that time 1,449 drives failed, an annualised failure rate of 2.85%.
That is 88% higher than the 1.52% average across every drive in the same data, which earns it grade D (below average).
Among the 5 graded 8 TB hard drives it ranks 4 of 5 for reliability.
The rate has been steady: 2.31% over the latest 8 quarters against 3.43% before.
- Failure rate / year
- 2.85%
- Average, all drives
- 1.52%
- Drives in use
- 12,700
- Drive-years
- 50,867
- Failures
- 1,449
- Capacity
- 8 TB
- Type
- HDD
- Model number
- ST8000NM0055
Failure rate by quarter
| Quarter | Drive-days | Failures | Failure rate / year |
|---|---|---|---|
| Q1 2023 | 1,296,710 | 132 | 3.72% |
| Q2 2023 | 1,270,271 | 215 | 6.18% |
| Q3 2023 | 1,293,834 | 110 | 3.10% |
| Q4 2023 | 1,283,949 | 86 | 2.44% |
| Q1 2024 | 1,262,294 | 79 | 2.28% |
| Q2 2024 | 1,255,225 | 95 | 2.76% |
| Q3 2024 | 1,256,010 | 122 | 3.55% |
| Q4 2024 | 1,247,682 | 60 | 1.76% |
| Q1 2025 | 1,212,798 | 109 | 3.28% |
| Q2 2025 | 1,215,170 | 73 | 2.19% |
| Q3 2025 | 1,224,440 | 53 | 1.58% |
| Q4 2025 | 1,217,828 | 56 | 1.68% |
| Q1 2026 | 1,176,619 | 39 | 1.21% |
| Q2 2026 | 1,177,541 | 112 | 3.47% |
| Q3 2026 | 1,176,139 | 108 | 3.35% |
Single quarters with few drive-days swing widely; the overall figure above is the dependable one.
All 8 TB hard drives compared
| Grade | Model | Type | Size | Failure rate / year | Drives in use | Drive-years | Failures |
|---|---|---|---|---|---|---|---|
| A | Seagate ST8000NM000A | HDD | 8 TB | 0.37% | 229 | 806 | 3 |
| D | Seagate ST8000DM002 | HDD | 8 TB | 2.15% | 5,927 | 32,297 | 694 |
| D | HGST HUH728080ALE600 | HDD | 8 TB | 2.39% | 101 | 3,554 | 85 |
| D | Seagate ST8000NM0055 | HDD | 8 TB | 2.85% | 12,700 | 50,867 | 1,449 |
| F | HGST HUH728080ALE604 | HDD | 8 TB | 5.53% | 68 | 308 | 17 |
| – | Toshiba HDWF180 | HDD | 8 TB | 4.95% | 47 | 202 | 10 |
| – | Seagate ST8000DM005 | HDD | 8 TB | 1.16% | 15 | 86 | 1 |
| – | HGST HUS728T8TALE6L4 | HDD | 8 TB | 1.39% | 18 | 72 | 1 |