I went out and upgraded my WD 500 gb My Book to a WD 1 TB My Book Pro. I really like the look of the aluminum/silver. The one thing I am concerned about is the amount of fan noise that comes from the 1 TB. When using the 500 gb My Book I hardly heard the fan at all. Is it normal for my 1 TB to make that much more noise than the 500 gb? thanks.