Question about 7200 RPM hard drive temperature and Speedfan

[juicy]

Hi, I've just built my first computer, and I'm obsessing over the temperature readings according to speedfan. I've got a 7200 RPM hard drive, and its avg temperature so far is around 55-56 C. I've read that this is normal for a 7200 rpm drive, but do you think I should still get a fan for the drive?

Also, which reading is my CPU reading? The speedfan readings are like:

temp1: 29C
temp2: 38C
temp3: 21C
hd0: 56C
temp1: 40C

I'm thinking that the last one is probably my CPU reading (A64 3700 san diego), but I'm not too sure... thanks for any info you can give me!

 

[juicy]

I have no idea why there's two temp 1's. Here's a shot of whats going on:

http://img74.imageshack.us/my.php?image=speed2vr.gif

 

[juicy]

ok cool thanks. I've got two 120 mm case fans currently, one front, one back. Both are blowing outwards though, I guess the front one is supposed to be blowing inwards onto the hard drive? The drive is located in the front too.

I don't got much gear inside, only 1 HD, 1 7900 gt, and the aforementioned processor. No OCing going on, either.

Also, what does PWM stand for?

edit: ok, the HD temp is now down to 50C, hopefully that's good enuff.