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> probably the gasket is buna-n because it's cheap

No. Helium hard drives are laser-welded shut. See http://www.seagate.com/files/www-content/product-content/ent... for the details about what parts are made out of what and the basic details of fabrication.

That is really cool, thanks for the link. I should apparently make fewer assumptions.

I'm not sure why I thought there was a rubber seal, I have vague memories of seeing an exploded view with one somewhere.