Every quarter, Drive Stats gives us the numbers. This quarter, it gave us a crisis of meaning. What does it really mean for a hard drive to fail? Is it the moment the lights go out, or the moment we decide they have? Philosophers might call that an ontological gray area. We just call it Q3.
As of June 30, 2025, we had 332,915 drives under management. Of that total, there were 3,970 boot drives and 328,348 data drives. Let’s dig into our stats, then talk about the meaning of failure.
This quarter, we have more to talk about (Stats-wise) Drive Stats was the beginning. Want to see more of the full picture? Check out the Stats Lab webinar, bringing together content from all of our Stats articles. We’re going to chat about all things Backblaze (and beyond)—by the numbers.
Drive Stats: The digest version
Q3 2025 hard drive failure rates
During Q3 2025, we were tracking 328,348 storage drives. Here are the numbers:
Backblaze Hard Drive Failure Rates for Q3 2025 Reporting period July 1, 2025–September 30, 2025 inclusive
Drive models with drive count > 100 as of July 1, 2025 and drive days > 10,000 in Q3 2025
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