Putting hard drive reliablity to the test shows not all disks are equal

Hitachi drives crush competing models from Seagate and Western Digital when it comes to reliability, according to data from cloud backup provider Backblaze. Their collection of more than 27,000 consumer-grade drives indicated that the Hitachi drives have a sub-2 percent annualized failure rate, compared to 3-4 percent for Western Digital models, and as high as 25 percent for some Seagate units.

Hard drive manufacturers like to claim that their disks are extremely reliable. The main reliability measure used of hard disks is the mean time between failures (MTBF), and typically this is quoted as being somewhere between 100,000 and 1 million hours, or between 11 and 110 years.

These failures are generally assumed to follow a so-called bathtub curve, with relatively high failure rates when the drive is new—”infant mortality,” caused by manufacturing defects—and similarly when the drive nears the end of its useful life, but low failure rates in between.

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via Ars Technica http://ift.tt/1jm53WN


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