DiskGradeToshiba MG10ACA20TE 20 TB failure rate and reliability
B Grade B: Good
Backblaze logged 32,421 drive-years on the Toshiba MG10ACA20TE from Q1 2023 to Q3 2026, with 29,873 in service at the end of that period. In that time 268 drives failed, an annualised failure rate of 0.83%.
That is 46% lower than the 1.52% average across every drive in the same data, which earns it grade B (good).
The rate has been steady: 0.82% over the latest 7 quarters against 0.87% before.
- Failure rate / year
- 0.83%
- Average, all drives
- 1.52%
- Drives in use
- 29,873
- Drive-years
- 32,421
- Failures
- 268
- Capacity
- 20 TB
- Type
- HDD
- Model number
- MG10ACA20TE
Failure rate by quarter
| Quarter | Drive-days | Failures | Failure rate / year |
|---|---|---|---|
| Q3 2023 | 50 | 0 | 0.00% |
| Q4 2023 | 182 | 0 | 0.00% |
| Q1 2024 | 182 | 0 | 0.00% |
| Q2 2024 | 182 | 0 | 0.00% |
| Q3 2024 | 187,309 | 7 | 1.36% |
| Q4 2024 | 444,356 | 8 | 0.66% |
| Q1 2025 | 633,439 | 11 | 0.63% |
| Q2 2025 | 1,203,686 | 20 | 0.61% |
| Q3 2025 | 1,416,127 | 21 | 0.54% |
| Q4 2025 | 1,656,127 | 28 | 0.62% |
| Q1 2026 | 1,665,263 | 42 | 0.92% |
| Q2 2026 | 2,117,524 | 64 | 1.10% |
| Q3 2026 | 2,509,259 | 67 | 0.97% |
Single quarters with few drive-days swing widely; the overall figure above is the dependable one.