Bearing types

[The King of Pants]

I've always understood that sleave bearings were crap, but I just ran accross a couple of diferent products that offered an option between dual Ball-bearing and something called hydro wave that i'd never seen before, could some on clue me in on the difference?

 

[RickyJ]

My Maxtor HD uses a hydro-wave bearing. It's super quiet.

I'm not sure how hydro-wave bearings are constructed. There's also the "vapo" bearings that SilenX uses, but I have a feeling that they're pretty similar (if not the same).