As of March 31, 2020, Backblaze had 132,339 spinning hard drives in our cloud storage ecosystem spread across four data centers. Of that number, there were 2,380 boot drives and 129,959 data drives. This review looks at the Q1 2020 and lifetime hard drive failure rates of the data drive models currently in operation in our data centers and provides a handful of insights and observations along the way. In addition, near the end of the post, we review a few 2019 predictions we posed a year ago. As always, we look forward to your comments.
Hard Drive Failure Stats for Q1 2020

At the end of Q1 2020, Backblaze was using 129,959 hard drives to store customer data. For our evaluation we remove from consideration those drives that were used for testing purposes and those drive models for which we did not have at least 60 drives (see why below). This leaves us with 129,764 hard drives. The table below covers what happened in Q1 2020.