These results seem at odds with the warranties for each model. For the enterprise model (ST8000NM0055) you would expect 93.6% of the drives to survive five years.For the consumer model (ST8000DM002) you would expect nearly 95% of the drives to survive five years.If you purchased either drive, the life expectancy is nearly the same for early on, but starts to separate at about two years and the difference increases over the next three years.Let’s take a look at the life expectancy curves and see what else we can learn. Their lifetime annualized failure rates tell an interesting story. The 8TB Seagate model: ST8000DM002 is classified as a consumer drive, while the 8TB Seagate model: ST8000NM0055 is classified as an enterprise drive. The two 8TB drives we’ve chosen to compare using life expectancy curves have done battle before. In short, sometimes, the pricing and availability of the HGST was good enough so we bought them. We had anecdotal information that the HGST drives were better, but little else. At the time we were purchasing these Seagate and HGST drive models back in 2013 through 2015, there were no life expectancy curves and Drive Stats was just starting. Why Buy HGST Drives at All?įair question. Yes, it’s work, but hardly something you would need to hire a person specifically to do. That’s 30-40 minutes a day someone spent doing that task spread across multiple data centers. That is 700 drives a year or about two Seagate drives per day we had to replace. We replaced a little over 4,200 more Seagate drives over a six year period than HGST drives. So, let’s do a little back-of-the-envelope math to see how we landed. In the simple case, if the time and effort we spent replacing the failed Seagate drives was more than the savings, we failed. We explain some of the thinking behind our decision-making in our “How Backblaze Buys Hard Drives” post. In our case, these factors are intertwined. In the case of buying one or two drives, you may find a single factor like, “how much do you have to spend” is the only thing that matters. In addition, the Seagate drive was readily available while the HGST drive was harder to get, and finally, at the time of purchase there was over an 80% chance that the Seagate drive would still be alive after six years. For example, suppose I told you that the HGST drive you wanted was 1.2 to 1.5 times as expensive as the Seagate drive.
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