Backblaze Drive Stats for Q2 2025

Summary

With hundreds of thousands of hard drives spinning 24/7, our data centers are less like peaceful white-noise oases and more like a a series of obstacle courses—if said obstacle courses were about managing over four exabytes of customer data from archival backups to streaming media to AI training datasets. Sure, they’re obstacle courses we all (and I’m including you, users of the internet) collectively create, but it’s no less of a balancing act to find the contestants (erm, hard drives) that can go the distance. And we, dear readers, get to watch it all. Welcome to Drive Stats: where failure is inevitable, survival is fascinating, and every quarter brings a new leaderboard. As of June 30, 2025, we had 321,201 drives under management. Of that total, there were 3,971 boot drives and 317,230 data drives. Stay tuned as we take our standard peek into quarterly and lifetime failure rates, and do a deep dive into the 20TB+ club. As always, we’ll see you in the comments section. This month, you’ll also get three (count ‘em, three!) opportunities to talk to us in person as well—virtually at our Drive Stats LinkedIn Live on August 5 (today), or twice in Las Vegas at DefCon on August 7 and 8. Sign up for the Drive Stats LinkedIn Live Ready to dive deeper into the data? Tune in today at 10:00 a.m. PT, to query the Drive Stats team, Stephanie Doyle and Pat Patterson. We’ll see you there! Drive Stats by the numbers: The digest version Q2 2025 hard drive failure rates For those that are new to the Drive Stats report, it’s worth mentioning that we have certain criteria that we use to select drives for consideration each quarter. We’ll discuss those in the next section, but for now, let’s talk about the data. The table below shows the failure rates for Q2 2025. Backblaze Hard Drive Failure Rates for Q2 2025 Notes and observations The annual failure rate is lower this quarter. We had some major fluctuations last quarter. Quoting ourselves from May 2025: The quarterly failure rate is ...