On Wed, Nov 02, 2022 at 12:06:16AM -0500, David Wright wrote: > On Tue 01 Nov 2022 at 06:49:09 (+0100), tomas@tuxteam.de wrote: [...] > > This is only a half-truth. You know what goes out faster than helium? > > Vacuum. And there was a whole glorious epoch in electronics which did > > rely on keeping vacuum "in". You should have some fond memories of > > that. > > To be fair, most vacuum tubes aren't bathed in helium, but air, and > then only at a one atmosphere differential pressure. A gas cylinder > might be as high as 500 atmospheres. But not a harddisk. My point was somewhat tongue-in-cheek: even assuming He diffuses out of the harddisk, we've got very good at keeping air out (cf. vacuum tubes), so you'll be left with... vacuum. Heads would fly lower, not higher. Actually heads would roll on the tarmac :-) Of course, if you've got 200 or 500 bar, something might leak. > And vacuum tubes do contain a getter to deal with outgassing, which > will help mitigate slight leaks. Oxygen. Not nitrogen, AFAIK. Talk nerds getting off-topic :-) Cheers -- t
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