There are sneaky way sto go back and forth AHCI / IDE without re-isntalling windows, but it is a bit tricky and things can easily go wrong if you don't do it right - I have always run in SATA IDE mode and things run smooth and fast - If you don't have a need for hot swapping or NCQ, run in IDE - I'm running in IDE mode and I get excellent HDTune and HDTach results with sustained reads over 75MB/s, bursts in the 175-180MB/s.
As far as the loud clicking definately not normal! Yes the seagates will sometimes make a "chink..clink" type of sound from time to time, but any loud KLONK-KLONK-KLONK sound is NOT a sound you ever want to hear !
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