Chris Mellor writes in
"Just 139 out of 10,000 12TB Seagate drives fail a year, and Western Digital's HGST brand has an even better rate of 51 in 10,000, according to cloud backup service provider Backblaze, which has 104,778 drives spinning in its data centre.
It's not an exhaustive study; the firm listed just four brands in its estate, with models ranging from older ones with 3TB of capacity to newer 12TB drives and some 14TB drives from Toshiba. However, it does provide some data points for the curious..."
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