This is the information about my PC:

Studio XPS 435T
Windows 7 professional
Intel(R) Core(TM) i7 CPU 920 @ 2.67 GHz 2.67 GHz

It has like two HDDs so that it automatically copies the data from one of them to the other one for the case of something happens...

Anyways the only noise I hear from the case is from HDD like it's a kind of scratchy noise as the HDD rotates...(It's definitely from HDD not any other fan)

Ever since I connected the second HDD the noise has become more. So I was wondering if you guys have any suggestion for me to reduce it. I opened the case but I couldn't figure out anything to do because the HDD has warranty and there is a label on it. An IT guy in charge of my system told me it's natural and I need music since my office is really quite


PS. How can I tell it to only copy the data after I shut down the computer since my suspicion is that it is copying the data automatically...Not sure though