The small amount contained in the HDD would a minimal risk. Larger amounts handled in the manufacturing process, OTOH... I'm curious how the shaft seals for g

The small amount contained in the HDD would a minimal risk. Larger amounts handled in the manufacturing process, OTOH... I'm curious how the shaft seals for generators manage to seal the hydrogen. Perhaps the hydrogen is contained within the the generator and not exposed to the seals, though I thought one of the reasons for its use (along with cooling) was reduced windage losses.