Backblaze in 2013 reported that disks fail in a "bathtub" fashion. High early failures from infant mortality (0-18 months), decreased failure rates after the infant mortalities (18 months to 3 years), and rising failure rates as disks aged (3-4 years).

With more disks in their arrays, more data, and improving disk quality the infant rate has dropped and the rising rates have been pushed out. Life expectancy was 50% at 6 years, now it is 88%.
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With more disks in their arrays, more data, and improving disk quality the infant rate has dropped and the rising rates have been pushed out. Life expectancy was 50% at 6 years, now it is 88%.
Drive Failure Over Time: The Bathtub Curve Is Leaking
Hard drive failure rates tend to follow the “bathtub curve.” What is this curve, and how does it indicate the drive failure rates at Backblaze?
