Fan is on all the time since I replaced the HD

I just replaced my stock macbook HD with a Hitachi 160GB 5600RPM HD and ever since I have noticed that the fan is always on. Right now, for example, CPU A is 36C and the fan is running at 1495. When I first started the machine this morning the temperatures were in the teens but the fans were running anyway.
I backed my machine up, replaced the HD, re-installed the OS from the disks, used migration assistant to restore data from the backup, and then let the software update do it's job.
Any ideas what is going on? I think I'll swap in my old drive and see if it behaves any differently.
(40C now, still 1494)
Ben

I switched back to my old drive (ridiculously easy to do in a macbook, thanks apple!) and started it up but couldn't hear the fan. When I checked iStat pro, however, it was just as you said - the fan was running at about 1500 rpm. I just couldn't hear it. Switching back to the new drive, I could hear the "fan" again. I really does not sound like the drive, but what else could it be? iStat is telling me the fan is running at 1500 rpm just as before so the only new sound could be the drive itself. Nothing horrible, just noticeable. Certainly something I'll live with to gain the extra 100GB.
Before I put this to bed I want to figure out a way to put the drive to sleep and see what the machine sounds like then (because it really really sounds like a fan to me - though I can hear it best coming right from where the drive is located so... it all points to a much louder drive).
Ben

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