I am beginning to wonder if the constant fan noise of my PowerBook G4 is being caused by the harddrive. The sensor underneath my harddrive is recording temperatures at or greater than 46 C. By way of comparison, my processor is recording a temperature of 41.8 C - 42.5 C. The fans only go on when the harddrive sensor hits exactly 46 C and don't go off until the same sensor reads 44 C. The CPU and GPU temps do not change that much when the fan comes on.
I should also note that the hottest part of the computer - by far - is the left palm rest where, you guessed it, the hard drive is.
Here is my theory: Basically, I think the hard drive is a heat monster and if I replaced it with a cooler drive, I might get away with no more fan noise.
It seems to me that the only PowerBook owners that are really complaining about the fan noise are those with the newest generation of PowerBooks (Rev. D models). The earlier (Rev. A, B, and C models) all came with 4200 rpm harddrives and mine came with a 5400 rpm HD.
Since I don't care about HD performance too much, I was thinking about the possibility of downgrading to a slower HD. The biggest differences that I've found is that my HD seems to use a huge amount of wattage to read/write and when in standby.
I found a 4200 rpm Fujitsu at Newegg that uses far less wattage.
Here are the stats of the two hard drives for comparison:
The one I want to buy: http://www.fcpa.fujitsu.com/products/hard-drives/mhv2120at/specifications.html
For each one, scroll down to where it lists the Power Consumption.
Finally my question: Will the drastic differences in wattage for the two HD's lead to a noticeable difference in heat dissipation? If I went with the slower (but larger) HD listed above would I be able to decrease the HD area by a few degrees C?