On 09/17/2016 02:43 PM, Larry Sheldon wrote:
My experiences were back in the days of washing-machine class disc
drives and they were a 4-hour fire-wall away, but I don't remember them
being impacted. (I can't believe that I was allowed to conduct a test
with them running, but I don't remember shutting them down.)

I wonder if orientation mattered--mine were all platters parallel to the
floor, I wonder if the damaged ones were parallel to the wave front.

If you watched the video of the guy who screamed at his disk drives to cause temporary faults, the JBOD had its platters horizontal to the floor.

One of the reason the washing-machine-sized CDC Storage Module Drives weren't affected by high noise level is the sheer beefy mass of the head assembly and the voice coil. Also, the track spacing on the platters of those drives was far less dense, so any noise-induced mis-tracking would be minuscule, and easily handled by said voice-coil's position-error system. The heads were larger, as well as the head arms. In this situation, mass is your friend.

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