Online backup solution provider Backblaze has released its much-renowned, annual hard drives reliability and failure report. From a report on ArsTechnica: The company uses self-built pods of 45 or 60 disks for its storage. Each pod is initially assembled with identical disks, but different pods use different sizes and models of disk, depending on age and availability. The standout finding: three 45-disk pods using 4TB Toshiba disks, and one 45-disk pod using 8TB HGST disks, went a full year without a single spindle failing. These are, respectively, more than 145 and 45 years of aggregate usage without a fault. The Toshiba result makes for a nice comparison against the drive's spec sheet. Toshiba rates that model as having a 1-million-hour mean time to failure (MTTF). Mean time to failure (or mean time between failures, MTBF -- the two measures are functionally identical for disks, with vendors using both) is an aggregate property: given a large number of disks, Toshiba says that you can expect to see one disk failure for every million hours of aggregated usage. Over 2016, those disks accumulated 1.2 million hours of usage without failing, healthily surpassing their specification. [...] For 2016 as a whole, Backblaze saw its lowest ever failure rate of 1.95 percent. Though a few models remain concerning -- 13.6 percent of one older model of Seagate 4TB disk failed in 2016 -- most are performing well. Seagate's 6TB and 8TB models, in contrast, outperform the average. Improvements to the storage pod design that reduce vibration are also likely to be at play.
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