For specific numbers, Backblaze says that large drives “total 66% of the drive days total, while only producing 57% of the drive failures. That could point to problems for the average consumer, who is less likely to need a drive above 12TB in capacity, but it’s also worth pointing out that Backblaze’s larger drives were also newer. Overall, failure rates were low, with an average AFR of 1.01% across all drives, although smaller drives (those below 12TB) made up the majority of issues. What does this all mean for hard drive storage in 2021 overall? Backblaze has published its Q1 2020 hard drive stats, which looks at the failure rates for 129,764 hard drives from HGST, Toshiba, and Seagate (this figure excluded test drives and drive.
The pods are custom-built and used to hold backup data from customers and to support the B2 cloud storage offering. Similarly, its 16TB Toshiba additions are also off to a strong start. Since 2014, Backblaze has been collecting and publishing hard drive reliability information for their storage pods. Specifically, the 16TB WDC drive collection it added this year has only been in the fleet for an average of 5.06 months but has a low AFR of 0.14%. While Backblaze’s oldest drive was also its most stable, the company’s data also suggests that newer drives are holding up well. Regardless, if you’re curious, the formula for calculating AFR is as follows: AFR = (drive failures / (drive days/365)) * 100. This, overall, provides a more accurate picture, making sure that new, unfailing drives added in Q4 don’t make a model look more reliable than it otherwise might have.
Its data sheets refer to these with a term called “AFR,” which stands for “annualized failure rate.” This is slightly different from “annual failure rate,” in that it adjusts the data to account for drives which were added to or removed from the fleet partway through the year. Before we move on, it’s important to address how Backblaze counts failure rates. Backblaze, a cloud-storage provider that uses consumer-class hard disk drives and extensive replication mechanisms to store data for its customer, has published yet another HDD reliability report.
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