Hard drive and brightness increase/decrease noise

Hi,
It's been a couple of months since am I hearing a lot of noise from my hard drive. Supposedly I am browsing safari and the next moment, I open a finder window, it feels like the HD rises from the dead with that noise and it takes about 3-5 seconds to get that finder window. I hear s stomach grumblking noise (as reported by many others) and its mostly everytime. Simple tasks like writing an email or browsing or opening an application or compiling some code; absolutely anything.
The other issue is that when I decrease the brightness of the machine from high to low, I get some weird sound. I don't think I'll be able to describe how the sound is in actuality but its quite unusual.
Any opinions here?
Regards
[iMac 27" Base Model]

I'd agree with Michael... this sounds normal. Especially since you mentioned you were downloading torrents. Your drive will write little bits as it downloads them... and also, your drive will be reading the data you're downloading as you're typically seeding the torrent for other downloaders.

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    The fix you sent me semed to work great until I noticed that I did not have any music after the letter "a" (namely 1/36 of the music). I ried it again with another copy I had and lost that too. Now, I am working with the copy I had on the other computer, which doesn't have all the data, but does have most of it, and I can survive adding the other stuff later somehow by re-copying the music and getting the data over again, but I do want to somehow get the other 35 letters worth, if possible.
    David Molony

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