Backblaze publishes the hard drives that have failed the most on their servers

Earlier this year we had released the Backblaze data on which hard drives had failed the most on their servers during the first months of 2018, and now they are updating that data again, but corresponding to the second quarter.

Backblaze statistics belong to the second quarter of 2018

As of June 30 of this year, Backblaze had some 100, 254 hard drives in operation in its data centers. Of that number, there were 1, 989 boot drives and 98, 265 data drives. This review examines the quarterly and lifetime statistics of the operating data unit models, to check their failure rate, or reliability.

The quarterly chart for the second quarter of 2018 was based on 98, 184 hard drives. That was just 138 more hard drives than in the first quarter of 2018, which was based on 98, 046 drives. However, almost 40 PB of storage was added.

Backblaze comments that the combined AFR for all larger disk drives (8, 10, and 12TB) is only 1.02%. Many of these units were implemented last year, so there is some 'volatility' in the data, but this global rate is expected to decrease slightly in the next two years.

The overall failure rate of all hard drives in service is 1.80%. This is the lowest they have reached, exceeding the previous low of 1.84% since the first quarter of 2018.

From the table, you can see that the 4TB Seagate has been the disk with the largest failure rate of 1.85%, only behind the 6TB Western Digital at 2.76%. Although the failure rate of the 4 TB HGST model is 4.68%, this percentage comes from just 78 units, few to make a reliable statistic, but it is a fact.

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