The 4 TB Seagate ST4000DM000 showed the highest AFR of 2.57% with an operating time of 2.2 million days at the same time. The lowest AFR of 0.28% was demonstrated by Western Digital’s 16 TB model WUH721816ALE6L4 with a sample of 14,098 units. The average annual default rate (AFR) continued to increase, reaching 1.4%. ![]() The company offered statistics on 236,893 drives in 30 models over almost 10 years, excluding drives that are currently being tested and models with fewer than 60 instances on its servers. ![]() Looking at a table sorted by storage capacity, it seems that the smaller the model, the more reliable it is, but this is a “statistical trap”: the company has models with a capacity of 1, 1.5, 2, 3 and retired 5TB and larger models will continue to function – meaning their average lifespan will increase over time.īackblaze also presented the traditional quarterly report. According to Backblaze, the results largely agree with the information about safe data recovery.Īverage age of hard drives before failureĪnti-record holder in the table was the 12TB model Seagate ST12000NM0007, which had 2032 failures at an average age of 1 year and 6 months – partially losing to the 4TB model Seagate ST400DM000 with 5249 failures but an average lifespan from 3 years and 3 months. Drives that are no longer used in the company’s data center also had to be excluded: 25 models and 3379 failed copies – for which, by the way, it turned out that the average time to failure was 2 years and 7 months, so a little higher. Backblaze achieved this by looking at all failed disks and hours of operation for each instance: the statistics included each drive’s failure date, model, serial number, failure type, and SMART value, disks without SMART attributes, and disks with data exceeding were written beyond the allowed size.
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