The whole thing about fast-RPM drives is that heat WILL kill them, period.

FAST DRIVES MUST BE COOLED in order to survive any length of time. The more I read about the silentPC enclosure, the more I think it's a bad idea.

I've had some server drives go bad which I thought were adequately cooled. The problem is that there were three hot drives mounted right next to each other in the tower, and the feedback-loop of shared heat killed them after a few months.

Sometimes you need fans blowing directly over your drives if you want them to last.