BackBlaze's Hard Drive Reliability Review for 2015: Which Hard Drive to buy when you want to build a Cloud Storage Center

This is an automatic summary, original reduced by 87%.

A defined group to observe, in our case a group of drives, usually by model, a period of observation, typically a year, the number of drive failures in the defined group over the period of observation, and the number of hours a group of drives are in operation over the period of observation.

The chart on the left is the total number of drives and the chart on the right is the total number of drive hours for all the data drives by each manufacturer.

The HGST drives are older, as such they have more drives hours, but most of our recent drive purchases have been Seagate drives.

While their cumulative failure rate was slightly high at 10.1%, they were removed from service because we only had 225 of those drives and it was easier to upgrade the Storage Pods to 4TB drives than to buy and stock the 2TB Seagate drives.

We continued to add 6TB drives over the course of 2015, bringing the total to nearly 2,400 drives Below are the Q4 and Cumulative Failure Rates for each of these drives.

Over their lifetime the 5TB Toshiba drives have a 2.70% annual failure rate with 1 drive failure and the 8TB HGST drives have a 4.90% annual failure rate with 2 drive failures.

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