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Backblaze has released its hard drive reliability statistics for Q3 2017.

Backblaze, which provides backup solutions, compared hard drives used in its operations from Seagate, Western Digital, Toshiba, and HGST.

In Q3 2017, Backblaze introduced 10TB and 12TB hard drives into its data centres.

“We continued to retire 3TB and 4TB hard drives to increase storage density, and we added over 59 petabytes of data storage to bring our total storage capacity to 400 petabytes,” said Backblaze.

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 over Q3, along with the lifetime reliability of the drives – since April 2013.

Q3 2017 Failure Rates

Model Drive Count Drive Days Drive Failures Annualised Failure Rate
3TB Hard Drives
WD WD30EFRX 180 29,927 1 1.22%
4TB Hard Drives
Toshiba MD04ABA400V 146 13,427 0 0.00%
WD WD40EFRX 46 4,232 0 0.00%
HGST HMS5C4040BLE640 15,047 1,419,590 14 0.36%
HGST HMS5C4040ALE640 6,629 720,083 9 0.46%
HGST HDS5C4040ALE630 2,490 249,536 4 0.59%
Seagate ST4000DM000 33,510 3,152,542 283 3.28%
Seagate ST4000DM001 400 36,783 19 18.85%
Seagate ST4000DX000 145 14,083 12 31.10%
5TB/6TB Hard Drives
Toshiba MD04ABA500V 45 4,140 0 0.00%
Seagate ST6000DX000 1,882 173,261 1 0.42%
WD WD60EFRX 441 40,642 2 1.80%
8TB Hard Drives
HGST HUH728080ALE600 45 4,140 0 0.00%
Seagate ST8000DM002 9,879 908,298 18 0.72%
Seagate ST8000NM0055 14,404 982,738 28 1.04%
10TB/12TB Hard Drives
Seagate ST10000NM0086 1,220 12,500 0 0.00%
Seagate ST12000NM0007 20 500 0 0.00%

Lifetime Failure Rates

Model
Drive Count Annualised Failure Rate
3TB Hard Drives
WD WD30EFRX 180 5.13%
4TB Hard Drives
HGST HMS5C4040BLE640 15,047 0.50%
HGST HMS5C4040ALE640 6,629 0.60%
HGST HDS5C4040ALE630 2,490 0.82%
Toshiba MD04ABA400V 146 1.10%
WD WD40EFRX 46 1.90%
Seagate ST4000DM000 33,510 3.00%
Seagate ST4000DX000 145 9.90%
Seagate ST4000DM001 400 20.30%
5TB/6TB Hard Drives
Seagate ST6000DX000 1,882 1.20%
Toshiba MD04ABA500V 45 1.70%
WD WD60EFRX 441 4,60%
8TB Hard Drives
Seagate ST8000DM002 9,879 1.10%
Seagate ST8000NM0055 14,404 1.20%
HGST HUH728080ALE600 45 1.70%
10TB/12TB Hard Drives
Seagate ST10000NM0086 1,220 0.00%
Seagate 12000NM0007 20 0.00%

Now read: How hard drive prices have changed over the last 8 years – Price per GB

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  • That Guy Jon

    I’ve got a seagate 240gb that i bought in 2006 and that badboy is still going strong!

    Also a WD 320gb from 2008 also kicking stronger than a mule in his prime!

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