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Thanks for jogging my memory!

It was indeed Argon, not Halon, and the pressure issues that broke HDDs.

And the other comment made me google noise vs. pressure....

Looks like Siemens did an investigation and tested various parameters (pressure, noise, vibration) independently.

They point towards noise, not pressure. Really interesting as I am _sure_ I was told it is pressure. But that might be 100% wrong!

Noise really is just pressure, with a high frequency time component.

This is particularly noticeable with over-ear noise cancelling headphones.

The feeling of anti-sound is quite distinctive.

It does feel like ‘pressure’ on your ears/inside your head. Not very comfy actually