Dell Dimension E510 Hardrive Problem

I have a Maxtor 6L080M0 Hard Drive. My problem, is when I switch the Hard Drive Acoustic mode in the BIOS to "performance" the Hard Drive makes a little clicking sound.. the Hard Drive is louder since it is spinning harder which is normal.. but it begins to make a little click sound when its being used. It sounds like it gets off track or something. This sound ONLY happens when its in this "performance" Acoustic mode. Does anybody else have this problem?? I have also contacted Maxtor, and they say my Hard Drive is dying. I find that hard to believe since its only going on two years old. I have also ran the Seatools for Windows, and it failed the tests.. but I haven't noticed any other strange noises from my Hard Drive. Can anybody give me any advice? Thanks.