https://www.techpowerup.com/243840/b...iability-stats

As of March 31, 2018 we had 100,110 spinning hard drives. Of that number, there were 1,922 boot drives and 98,188 data drives. This review looks at the quarterly and lifetime statistics for the data drive models in operation in our data centers. We'll also take a look at why we are collecting and reporting 10 new SMART attributes and take a sneak peek at some 8 TB Toshiba drives. Along the way, we'll share observations and insights on the data presented and we look forward to you doing the same in the comments.