Alright, I've read tons of other threads on this issue, almost everyone says that this is a result of a bad drive, but there has to be another explanation I think in my case... I currently have two systems self built, both have 3 drives each. I have a newer system with 2 satas, 1 pata. An older system with 3 patas. The new system has 3 brand spanking new drives in it, running vista, old system running xp. Both have clicking noises that come from the secondary ide drives. Probably a click once every 30 minutes. Smart report on all the drives shows that they're all in the 90th percent for performance and fitness, with no watch's on any of the drives. I can take the drives, switch them around, and the same position in the ide line will cause the other drive that was working perfectly in it's previous position, to click. I can also take the drive that is then clicking, put it in a usb housing, and it'll run perfectly, with no click. So what's going on? Is it power maybe, or something wrong with the controller on two seperate boards, or what?