I have the same HD, and yes, that is normal. Don't worry about it, I have a 80gig WD and that's hot enough to cause 3rd degree burns on my fingers (no joke). I do recommend to put a fan on it. That drops the temp all the way down to 29-31 C. It doesn't have to be a high speed fan, I'm using a 80mm fan at 1500 RPM to get those temps.