Backblaze again supply great information of hard drive reliability:
Number of Hard Drives by Model at Backblaze
| Model | Size | Number of Drives | Average Age in Years | Annual Failure Rate |
|---|---|---|---|---|
| Seagate Desktop HDD.15 (ST4000DM000) | 4.0TB | 5199 | 0.3 | 3.8% |
| Hitachi GST Deskstar 7K2000 (HDS722020ALA330) | 2.0TB | 4716 | 2.9 | 1.1% |
| Hitachi GST Deskstar 5K3000 (HDS5C3030ALA630) | 3.0TB | 4592 | 1.7 | 0.9% |
| Seagate Barracuda (ST3000DM001) | 3.0TB | 4252 | 1.4 | 9.8% |
| Hitachi Deskstar 5K4000 (HDS5C4040ALE630) | 4.0TB | 2587 | 0.8 | 1.5% |
| Seagate Barracuda LP (ST31500541AS) | 1.5TB | 1929 | 3.8 | 9.9% |
| Hitachi Deskstar 7K3000 (HDS723030ALA640) | 3.0TB | 1027 | 2.1 | 0.9% |
| Seagate Barracuda 7200 (ST31500341AS) | 1.5TB | 539 | 3.8 | 25.4% |
| Western Digital Green (WD10EADS) | 1.0TB | 474 | 4.4 | 3.6% |
| Western Digital Red (WD30EFRX) | 3.0TB | 346 | 0.5 | 3.2% |
| Seagate Barracuda XT (ST33000651AS) | 3.0TB | 293 | 2.0 | 7.3% |
| Seagate Barracuda LP (ST32000542AS) | 2.0TB | 288 | 2.0 | 7.2% |
| Seagate Barracuda XT (ST4000DX000) | 4.0TB | 179 | 0.7 | n/a |
| Western Digital Green (WD10EACS) | 1.0TB | 84 | 5.0 | n/a |
| Seagate Barracuda Green (ST1500DL003) | 1.5TB | 51 | 0.8 | 120.0% |
Interesting comment: "The drives that just don’t work in our environment are Western Digital Green 3TB drives and Seagate LP (low power) 2TB drives. Both of these drives start accumulating errors as soon as they are put into production. We think this is related to vibration. The drives do somewhat better in the new low-vibration Backblaze Storage Pod, but still not well enough.
These drives are designed to be energy-efficient, and spin down aggressively when not in use. In the Backblaze environment, they spin down frequently, and then spin right back up. We think that this causes a lot of wear on the drive."
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