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The one 5TB drive failure occurred within the last 30 days. The confidence intervals are 0.0-48.3% for the 4TB drives and 0.3-72.9% for the 5TB drives. Here are the stats to date on those drives: We purchased and deployed 45 drives of each size in January 2015. Toshiba added 4TB and 5TB hard drives to their line over the last couple of years. Given the limited number of drives for each model, a comparison is not appropriate, but here’s how those 3TB Toshiba and Hitachi drives are performing in our environment: Besides the 45 Toshiba drives, we also have 10 of the Hitachi model HDS723030BLE640 drives that were the predecessors to the Toshiba drives. Though the current consumer channel price starts at $94.50 each on Amazon, we paid $106.73 each in early 2013. In January 2013 we purchased and soon after, deployed, 45 Toshiba 3TB hard drives (model: DT01ACA300). While the branding is now completely Toshiba, it is safe to say that a fair amount of Hitachi technology continues to live on in the Toshiba 3.5” drives. After Toshiba took over the business, the early 3TB drives (model: DT01ACA300) were dual branded Hitachi 3TB drives, model: HDS723030BLE640. This acquisition meant there would be more suppliers of 3.5” form-factor hard drives than the existing two (Seagate and Western Digital).
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Toshiba got back into the 3.5” form-factor hard drive business in 2012, when it acquired the production assets from Hitachi as part of Western Digital’s purchase of Hitachi.
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In our experience with Toshiba drives, here’s what we’ve learned so far. We’ve had one Storage Pod filled with Toshiba 3TB drives deployed for two years and we recently deployed Pods with 4TB and 5TB Toshiba drives. From HGST to Seagate to Western Digital hard drives, we’ve charted drive hours, plotted failure rates, reported on drive temperature, and more. Over the past year or so, we’ve covered the virtues and vices of nearly all the different hard drives we use in our Backblaze Storage Pods.