'Backblaze Statistical Data by Manufacturer and Model,' which visualizes HDD failure rates from actual operational status, will be released in the second quarter of 2025
Backblaze, which operates hundreds of thousands of HDDs in its data centers, regularly publishes the failure rates of the HDDs it uses. On August 5, 2025, the company released its results for the second quarter of 2025 (April 1 to June 30).
Backblaze Drive Stats for Q2 2025
As of June 30, 2025, Backblaze managed 321,201 drives, including 3,971 boot drives and 317,230 data drives. The data does not include models that met certain criteria, such as those with fewer than 100 drives and fewer than 10,000 operational days during the second quarter of 2025.
The failure rates for each model are as follows: From left to right, each column represents 'manufacturer,' 'model,' 'capacity,' 'number of units in operation,' 'average number of months in operation,' 'number of days in operation,' 'number of failures,' and 'annual failure rate (AFR).'
During the second quarter of 2025, the two models with zero failures were Seagate's '
Among the models that had at least one failure, the model with the lowest AFR was HGST's ' HUH721212ALE600 (12TB) ', with 2,608 units in operation, 2 failures, and an AFR of 0.31%.
Backblaze said, 'We are seeing significant fluctuations in failure rates for high-end products. Some drives have seen significant improvements in failure rates. In particular, the 12TB Seagate model ST12000NM0007 recorded an astounding 9.47% failure rate last quarter, but this has dropped to 3.58% this quarter. Since the number of drives has remained roughly flat (1st quarter: 1,038 units, 2nd quarter: 1,014 units), this indicates a definite change in failure rates. Furthermore, since the failure rate in the previous quarter was 8.72%, it is important to note whether this decrease in failure rate is a temporary phenomenon or a new trend.'
Backblaze also publishes the annual failure rate of its long-term operating models, which have exceeded 100,000 cumulative operating days as of the end of the second quarter of 2025.
In addition, as large-capacity models of 20TB or more have begun to be used in earnest, we have also released related data. Below is data on the number of months in operation, annual failure rate, and number of units in operation for Toshiba's '
Converting this into a graph, it looks like this: In this graph, the blue line represents the annual failure rate, and the red line represents the number of units in operation.
This is what it looks like with WDC's ' WUH722222ALE6L4 (22TB) '.
Converting it into a graph, it looks like this:
All other data is also available free of charge.
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in Hardware, Posted by log1p_kr