BRAVO TECHNOLOGY CENTER

Hard Drive Cumulative Failure Rates by Sam C. Chan
 

Published: December 10, 2011
Updated: October 2, 2013


According to major data centers in the US, all hard drives exhibit an average annual failure rate of approximately 4%, under heavy usage, operating in ideal environment, with perfect care. There is no discernable difference among manufacturers.

I highlighted the first year in green shade. As you can see, it tends to be very inconsistent. Failure rates of subsequent years tend to have extremely small standard deviation (low variation/dispersion).

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