The most reliable hard drives in the world

Backup solutions provider Backblaze has released its hard drive reliability statistics for Q2 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 April to 30 June 2018, along with the annualised failure rate.

The company had 100,254 mechanical drives as of 30 June 2018, 1,989 of which were boot drives and 98,625 of which were data drives.

Backblaze actively monitored 98,265 drives throughout Q2 2018, removing models without at least 45 drives present from the data.

Drives used for testing purposes were also removed from the data set.

The results of its report are detailed below.


Q2 2018 Failure Rates

Model Drive Count Drive Days Drive Failures Annualised Failure Rate
3TB Hard Drives
WD WD30EFRX 180 16,380 0 0.00%
4TB Hard Drives
WD WD40EFRX 46 4,173 0 0.00%
Toshiba MD04ABA400V 146 13,286 0 0.00%
HGST HMS5C4040BLE640 15,051 1,384,015 10 0.26%
HGST HMS5C4040ALE640 4,773 441,707 5 0.41%
Seagate ST4000DM000 27,476 2,645,254 134 1.85%
HGST HDS5C4040ALE630 78 7,791 1 4.68%
5TB/6TB Hard Drives
Toshiba MD04ABA500V 45 4,095 0 0.00%
Seagate ST6000DX000 1,832 168,450 4 0.87%
WD WD60EFRX 434 39,722 3 2.76%
8TB Hard Drives
Seagate ST8000NM0055 14,393 1,309,622 24 0.67%
Seagate ST8000DM002 9,886 899,939 25 1.01%
HGST HUH728080ALE600 1,044 95,056 3 1.15%
10TB/12TB Hard Drives
Seagate ST10000NM0086 1,220 111,020 0 0.00%
Seagate ST12000NM0007 21,580 1,816,181 57 1.15%

Lifetime Failure Rates

Model Drive Count Annualised Failure Rate
3TB Hard Drives
WD WD30EFRX 180 4.96%
4TB Hard Drives
HGST HMS5C4040BLE640 15,051 0.49%
HGST HMS5C4040ALE640 4,773 0.52%
HGST HDS5C4040ALE630 78 0.77%
Toshiba MD04ABA400V 146 0.87%
WD WD40EFRX 46 2.04%
Seagate ST4000DM000 27,476 2.84%
5TB/6TB Hard Drives
Seagate ST6000DX000 1,832 1.02%
Toshiba MD04ABA500V 45 1.34%
WD WD60EFRX 434 4.09%
8TB Hard Drives
Seagate ST8000NM0055 14,393 0.97%
Seagate ST8000DM002 9,886 1.03%
HGST HUH728080ALE600 1,044 1.18%
10TB/12TB Hard Drives
Seagate ST10000NM0086 1,220 0.32%
Seagate ST12000NM0007 21,580 1.12%

Now read: Why you don’t really need to “safely eject” your USB drive

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The most reliable hard drives in the world