Last week I spotted a hard-to-resist deal from Microcenter on Seagate's 1 terabyte ST310005N1A1AS drives, so I got two of them. I put them in the two empty bays inside my Mac Pro (8-core first generation Clovertown 3.0 Ghz) and set up a software striped RAID 0. I then used Carbon Copy Cloner to duplicate what I already had on my existing Seagate drives in the other two bays. Now, I'm using the two new drives for booting and all other uses, and every hour or so I'll hear a peculiar and fairly loud and noticeable "click-click" sound, that I never noticed with my older Seagate drives. Again, the specs on these new drives are 1TB, ST310005N1A1AS, 32mb cache, 7200 RPM. Any ideas?