Backblaze is transitioning from using 4 TB hard drives to 6 TB hard drives in the Storage Pods we will be deploying over the coming months. With over 10,000 hard drives needing to be purchased over the next several months, the choice of which 6TB hard drive to use is critical.

https://www.backblaze.com/blog/6-tb-hard-drive-face-off/

Backblaze needs to store 130 TB of incoming customer data every day.