I have three hard drives in my computer. A brand new 120 gig hooked into the mother board. I bought a IDE PCI card from maxtor and hooked two harddrives into that. All drives are acessable and seem to be working perfectly. Whenever I defrag with the program diskkeeper Lite it runs perfectly on my 120 gig drive on the mother board without hardly any noise.. Whenever I defrag a HD off the IDE card I get a weird clicking noise one time persecond. And it also sounds like the power supply on the computer is clicking on and off but it really isn't. The drive is doing what it is suppose to do and that is defrag. But just wondering why this noise occurs. Whenever I read from the drive normally it dosn't make these sounds. And the 120 gig HD is 7200rpm while the other two drives of the IDE card are 5400rpm. Any help would be appreciated. Thanks.