Do you run a raid array, is your machine on 24/7 ?

I do, and I'm bored of drives packing up after about a year or so, I currently have one on its way out now, I can hear its got more noise than when I bought it, so I know soon its going to die.

Someone else with the same drives had 2 go last week, both on 24/7 raid systems, both drives same age as mine.

(samsung 200gb)
(but I have lost lots of 120gb ibm deathstars)

I think they should start and put on the drives 'not for raid use' etc if they just cant take the pace.