Hi, I've got a few doubts regarding notebook system temperature, heat production and dissipation

-What's the upper limit of a notebook harddisk temperature?

-Which part of a notebook that produce heat the most? Is it the harddisk, RAM, CPU or the graphics card?

-How effective is a notebook cooler pad in heat dissipation?
-Is there any alternative that I can use?

--My laptop harddisk is constantly above 40 degree centigrades, only falls less than that when no application is running, not even screen saver or when the system is just started. This HAPPEN in any room temperature, with my cooler pad operating at USB POWER plus an external computer fan near the "vent". It even goes up to 55 - 60 degrees during defragmentation.
What computer make/model, what CPU, do you have Speedstep technology active (if Intel) and are you sure it is free of dust and all fans operating correctly? What does the manufacturer say the temp should be?does it SHUTDOWN? do to this heat problem.....all electrical products generate heat........one cure is have more air-flow......place the laptop on solid surface with WOODEN blocks under it..........a laptop/notebook should not be on your laptop........it will have more problems from body heat.......and do even more....to your body?not scaremongering a proven FACT.....