7200 rpm hard drives are the way to go. my laptop has a 2.5" one and with the fan going i don't hear the noise at all. as for the heat difference, right now the ambient temp. is about 68 degrees F and the hard drive is 40 degrees C. when it was like 80dF degrees in the summer the hard drive would usually be 47dC. (the max operating temp. is 55dC.) i don't know why they don't put 7200 rpm drives in all mid-full size laptops. my guess is that people think the more disk space the better the hard drive and 7200 rpm drives do use more juice.
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