The most reliable hard drives

Backblaze has released its hard drive reliability statistics for Q4 2017.

Backblaze, which provides backup solutions, 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 recorded the failure rates of its hard drives from 1 October to 31 December 2017, along with the real annual failure rate for each drive.

Throughout 2017, the company swapped out its 2TB, 3TB, and 4TB drives with 10TB, 12TB, and 14TB drives.

Backblaze added 25,746 drives and retired 6,442 drives in 2017, gaining an additional 211 petabytes of storage capacity during the period.


Q4 2017 Failure Rates

Model Drive Count Drive Days Drive Failures Annualised Failure Rate
3TB Hard Drives
WD WD30EFRX 180 16,200 0 0.00%
4TB Hard Drives
Toshiba MD04ABA400V 146 13,095 0 0.00%
HGST HMS5C4040ALE640 6,032 587,667 3 0.19%
HGST HDS5C4040ALE630 2,391 227,708 2 0.32%
HGST HMS5C4040BLE640 14,797 1,369,721 17 0.45%
Seagate ST4000DM000 32,070 2,969,705 235 2.89%
WD WD40EFRX 45 4,113 1 8.87%
Seagate ST4000DM001 392 36,506 9 9.00%
Seagate ST4000DM005 60 1,225 1 29.08%
5TB/6TB Hard Drives
Toshiba MD04ABA500V 45 4,050 0 0.00%
Seagate ST6000DX000 1,881 17,266 1 0.21%
WD WD60EFRX 437 39,856 4 3.66%
8TB Hard Drives
HGST HUH728080ALE600 45 4,420 0 0.00%
Seagate ST8000DM002 9,886 901,785 28 1.13%
Seagate ST8000NM0055 14,396 1,313,506 44 1.22%
10TB/12TB Hard Drives
Seagate ST10000NM0086 1,220 110,957 3 0.99%
Seagate ST12000NM0007 7,220 308,864 17 2.01%

2017 Failure Rates

Model
Drive Count Failure Rate
3TB Hard Drives
WD WD30EFRX 180 1.09%
4TB Hard Drives
HGST HMS5C4040ALE640 6,032 0.33%
HGST HDS5C4040ALE630 2,391 0.34%
HGST HMS5C4040BLE640 14,797 0.63%
Toshiba MD04ABA400V 146 0.70%
WD WD40EFRX 45 2.21%
Seagate ST4000DM000 32,070 3.17%
Seagate ST4000DM001 392 15.19%
Seagate ST4000DM005 60 29.08%
5TB/6TB Hard Drives
Toshiba MD04ABA500V 45 0.00%
Seagate ST6000DX000 1,881 0.70%
WD WD60EFRX 437 2.06%
8TB Hard Drives
HGST HUH728080ALE600 45 0.00%
Seagate ST8000DM002 9,886 0.96%
Seagate ST8000NM0055 14,396 1.21%
10TB/12TB Hard Drives
Seagate ST10000NM0086 1,220 0.89%
Seagate 12000NM0007 7,220 2.01%

Now read: I tried to wipe my hard drive with a magnet – This is what happened

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The most reliable hard drives