Backblaze stores over 250 petabytes of data across nearly 70,000 spinning hard drives. In the most recent quarter it added over 7,000 new drives to its storage arrays ? so it has a lot of experience and data concerning the performance of these drives, especially with regard to the irksome statistic of failure rates. The firm likes to try lots of drives, looking for a sweet price, performance and reliability balance. In the Q2 2016 reliability table, below, it lists data-only drives (not used for OS) and the table doesn't include any drive model of which there are fewer than 45 units in use.
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