Home / Tech News / Backblaze: 4 TB HGST and Seagate hard drives are most reliable, 3 TB Seagate and WD drives fail often (Brian Beach/Backblaze Blog)

Backblaze: 4 TB HGST and Seagate hard drives are most reliable, 3 TB Seagate and WD drives fail often (Brian Beach/Backblaze Blog)

It was one year ago that I first blogged about the failure rates of specific models of hard drives , so now is a good time for an update. At Backblaze, as of December 31, 2014, we had 41,213 disk drives spinning in our data center, storing all of the data for our unlimited backup service . That is up from 27,134 at the end of 2013. This year, most of the new drives are 4 TB drives, and a few are the new 6 TB drives. Let’s get right to the heart of the post. The table below shows the annual failure rate through the year 2014. Only models where we have 45 or more drives are shown. I chose 45 because that’s the number of drives in a Backblaze Storage Pod and it’s usually enough drives to start getting a meaningful failure rate if they’ve been running for a while. Backblaze Hard Drive Failure Rates Through December 31, 2014 Name/Model     Size     Number of Drives Average Age in years Annual Failure Rate 95% Confidence Interval HGST Deskstar 7K2000 (HDS722020ALA330) 2.0 TB 4,641 3.9 1.1% 0.8% – 1.4% HGST Deskstar 5K3000 (HDS5C3030ALA630) 3.0 TB 4,595 2.6 0.6% 0.4% – 0.9% HGST Deskstar 7K3000 (HDS723030ALA640) 3.0 TB 1,016 3.1 2.3% 1.4% – 3.4% HGST Deskstar 5K4000 (HDS5C4040ALE630) 4.0 TB 2,598 1.8 0.9% 0.6% – 1.4% HGST Megascale 4000 (HGST HMS5C4040ALE640) 4.0 TB 6,949 0.4 1.4% 1.0% – 2.0% HGST Megascale 4000.B (HGST HMS5C4040BLE640) 4.0 TB 3,103 0.7 0.5% 0.2% – 1.0% Seagate Barracuda 7200.11 (ST31500341AS) 1.5 TB 306 4.7 23.5% 18.9% – 28.9% Seagate Barracuda LP (ST31500541AS) 1.5 TB 1,505 4.9 9.5% 8.1% – 11.1% Seagate Barracuda 7200.14 (ST3000DM001) 3.0 TB 1,163 2.2 43.1% 40.8% – 45.4% Seagate Barracuda XT (ST33000651AS) 3.0 TB 279 2.9 4.8% 2.6% – 8.0% Seagate Barracuda XT (ST4000DX000) 4.0 TB 177 1.7 1.1% 0.1% – 4.1% Seagate Desktop HDD.15 (ST4000DM000) 4.0 TB 12,098 0.9 2.6% 2.3% – 2.9% Seagate 6 TB SATA 3.5 (ST6000DX000) 6.0 TB 45 0.4 0.0% 0.0% – 21.1% Toshiba DT01ACA Series (TOSHIBA DT01ACA300) 3.0 TB 47 1.7 3.7% 0.4% – 13.3% Western Digital Red 3 TB (WDC WD30EFRX) 3.0 TB 859 0.9 6.9% 5.0% – 9.3% Western Digital 4 TB (WDC WD40EFRX) 4.0 TB 45 0.8 0.0% 0.0% – 10.0% Western Digital Red 6 TB (WDC WD60EFRX) 6.0 TB 270 0.1 3.1% 0.1% – 17.1% Notes: The total number of drives in this chart is 39,696. As noted, we removed from this chart any model of which we had less than 45 drives in service as of December 31, 2014. We also removed Storage Pod boot drives. When these are added back in we have 41,213 spinning drives. Some of the HGST drives listed were manufactured under their previous brand, Hitachi.

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Backblaze: 4 TB HGST and Seagate hard drives are most reliable, 3 TB Seagate and WD drives fail often (Brian Beach/Backblaze Blog)

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