druck: I'm referring specifically to drives used in RiscPCs, here. They pretty much ran at room temperature in original models. The hard drives in my PC these days, with fans blowing over them, are hot to the touch. In my NAS downstairs, it's actually mildly uncomfortable to handle the hard drives if they've been working in the past 5 minutes. Of course, it's still within their design tolerance and they're server-grade drives anyway.