One more note on the noise level issue. Below is a portion of an email I received from Maxtor:
>To the human ear, BBs will sound 2 to 5 times louder than FDBs.
>
> More involved answer:
> One quick thing to note about comparisons between BB and FDB is that when
> we develop FDB drives, we have to do extra work to get rid of "discrete"
> tones that the ball bearing white noise would cover otherwise...things
> like little pops or beeps or clicks that really irritate the human ear
> which get uncovered when we make the white noise quieter by using fluid
> dynamic bearings. It's sort of like driving on the highway - your engine
> sounds louder and covers up discrete noises (the classic "pinging") you
> might hear otherwise while driving in the city.
>
> So, Maxtor is working to get rid of those tones in our FDB drives. I've
> been told my one of our product planners that the development
> might not be complete for Ares, but eventually we'll get rid of those
> discrete tones.