harddisk temperatures can be anything, ranging from room temperature, to 40 or 50 degrees C.
My WD raptor (10K rpm) usually hovers around 30C, but when it's running full speed for a while, it can go up to 45C. My other WD (120 gig) has no thermal sensor; a sensor from my coolermaster Aerogate puts the temperatures around 35 to 40C. The difference is mainly from the good cooling I have for my raptor, versus the lousy cooling for the other disk. Officially, WD harddisks are allowed to get up to 55C. However, I'd say that anything over 40 - 45C for longer periods should be avoided.
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