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From Brendan Gregg

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    This is entertaining and a technically solid job, but at some point you have to stop calling things like this a DoS attack. 44cm distance with over 100dbA acoustic pressure on an exposed HDD is simply not any real life scenario - you can as well smash it with your boot.

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      You can get ~130 dBA acoustic pressure at 1m with parametric ultrasonic speakers similar to Soundlazer. Your point stands, but we should be aware of the actual attack distance.

      1. http://www.convexoptimization.com/TOOLS/ReviewParametricAcoustics.pdf
      2. http://ieeexplore.ieee.org/document/7329300/