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Seagate ST4000DM000 4 TB failure rate and reliability
D Grade D: Below average
Backblaze logged 20,249 drive-years on the Seagate ST4000DM000 from Q1 2023 to Q3 2026. In that time 701 drives failed, an annualised failure rate of 3.46%.
That is 128% higher than the 1.52% average across every drive in the same data, which earns it grade D (below average).
Among the 3 graded 4 TB hard drives it ranks 3 of 3 for reliability.
The rate has been steady: 4.14% over the latest 5 quarters against 3.32% before.
Backblaze no longer runs this model, so these figures are historical.
- Failure rate / year
- 3.46%
- Average, all drives
- 1.52%
- Drives in use
- 0
- Drive-years
- 20,249
- Failures
- 701
- Capacity
- 4 TB
- Type
- HDD
- Model number
- ST4000DM000
Failure rate by quarter
| Quarter | Drive-days | Failures | Failure rate / year |
|---|---|---|---|
| Q1 2023 | 1,633,962 | 170 | 3.80% |
| Q2 2023 | 1,607,828 | 167 | 3.79% |
| Q3 2023 | 1,611,618 | 130 | 2.94% |
| Q4 2023 | 1,295,929 | 93 | 2.62% |
| Q1 2024 | 791,548 | 63 | 2.91% |
| Q2 2024 | 292,534 | 58 | 7.24% |
| Q3 2024 | 157,254 | 20 | 4.64% |
| Q4 2024 | 184 | 0 | 0.00% |
| Q1 2025 | 144 | 0 | 0.00% |
Single quarters with few drive-days swing widely; the overall figure above is the dependable one.
All 4 TB hard drives compared
| Grade | Model | Type | Size | Failure rate / year | Drives in use | Drive-years | Failures |
|---|---|---|---|---|---|---|---|
| A | HGST HMS5C4040BLE640 | HDD | 4 TB | 0.32% | 0 (retired) | 21,067 | 67 |
| A | HGST HMS5C4040ALE640 | HDD | 4 TB | 0.38% | 0 (retired) | 4,207 | 16 |
| D | Seagate ST4000DM000 | HDD | 4 TB | 3.46% | 0 (retired) | 20,249 | 701 |
| – | Toshiba MD04ABA400V | HDD | 4 TB | 1.04% | 0 (retired) | 96 | 1 |
| – | HGST HUS726040ALE610 | HDD | 4 TB | 0.00% | 0 (retired) | 53 | 0 |
| – | Seagate ST4000DM005 | HDD | 4 TB | 5.27% | 0 (retired) | 38 | 2 |