The most reliable hard drives in the world

Backup solutions provider Backblaze has released its hard drive reliability statistics for Q1 2018.

Backblaze compared hard drives used in its operations – from Seagate, Western Digital, Toshiba, and HGST – for the report.

Reliability was measured as an annualised failure rate, calculated using the number of drive failures relative to the number of drives.

Backblaze then recorded the failure rates of its hard drives from 1 January to 31 March 2018, along with the real annual failure rate for each drive.

The company had over 100,000 mechanical drives as of 31 March 2018, and was monitoring 98,188 drives which were used to store data.

Drives used for testing purposes and models without at least 45 drives were removed from the data set, leaving Backblaze with 98,046 hard drives.

The results of its report are detailed below.


Q1 2018 Failure Rates

Model Drive Count Drive Days Drive Failures Annualised Failure Rate
3TB Hard Drives
WD WD30EFRX 180 16,200 1 2.25%
4TB Hard Drives
WD WD40EFRX 45 4,050 0 0.00%
Toshiba MD04ABA400V 146 13,090 0 0.00%
HGST HDS5C4040ALE630 108 123,504 0 0.00%
HGST HMS5C4040BLE640 15,339 1,363,173 16 0.43%
HGST HMS5C4040ALE640 5,578 505,045 8 0.58%
Seagate ST4000DM000 30,941 2,822,282 178 2.30%
5TB/6TB Hard Drives
Toshiba MD04ABA500V 45 4,050 0 0.00%
Seagate ST6000DX000 1,881 169,017 1 0.22%
WD WD60EFRX 437 39,201 0 0.00%
8TB Hard Drives
Seagate ST8000NM0055 14,390 1,293,557 28 0.79%
Seagate ST8000DM002 9,891 888,774 21 0.86%
HGST HUH728080ALE600 1,045 94,024 3 1.16%
10TB/12TB Hard Drives
Seagate ST10000NM0086 1,220 109,738 0 0.00%
Seagate ST12000NM0007 16,800 1,296,465 32 0.90%

Lifetime Failure Rates

Model Drive Count Annualised Failure Rate
3TB Hard Drives
WD WD30EFRX 180 6.47%
4TB Hard Drives
HGST HMS5C4040BLE640 15,339 0.51%
HGST HMS5C4040ALE640 5,578 0.52%
HGST HDS5C4040ALE630 108 0.77%
Toshiba MD04ABA400V 146 0.94%
WD WD40EFRX 45 2.17%
Seagate ST4000DM000 30,941 2.90%
5TB/6TB Hard Drives
Seagate ST6000DX000 1,881 1.03%
Toshiba MD04ABA500V 45 1.45%
WD WD60EFRX 437 4.19%
8TB Hard Drives
Seagate ST8000DM002 9,891 1.04%
Seagate ST8000NM0055 14,390 1.08%
HGST HUH728080ALE600 1,045 1.20%
10TB/12TB Hard Drives
Seagate ST10000NM0086 1,220 0.47%
Seagate ST12000NM0007 16,800 1.09%

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The most reliable hard drives in the world