Hi, just bought a Mac Pro 1,1 with an Apple branded Hitachi 2tb drive on board. The drive is labeled as December 2011. Basically it makes like a ticking or ping sound 2-3 seconds like clockwork then after a while makes a few clicks then goes back to the ticking/ping routine. It also sounds like a plane taking off. I put it in my HP Microserver (mounted on its side on the proper plastic caddy that comes with the microservers) to see if it reacted differently and after closing the door it could be heard through 2 rooms with very thick walls due to the vibration. Disk Utility reports everything is fine, smart is verified, the drive checks out fine. When the drive spins down the ticking stops as expected. Is this normal for these Hitachi drives and does anyone know if I'd be able to get a replacement as its really disturbing. As the Mac Pro is from earlier 2008 and the HDD is 2011 it can't be from that computer. Cheers.