After much research I had decided on Hitachi drives for the refurb MacPro. I placed the order a couple of days ago and was notified yesterday that they are all back ordered, with no ETA yet. In some ways that didn't surprise me, since these drives seem to have been very hard hit by the problems in Japan and the lack of production facilities. I'm now starting my research again. I'm looking at Seagate Barracuda vs Western Digital(probably black). Of course there are other brands as well, but these two now have most of my attention if the Hitachis are ruled out. I have had good experiences with the Seagate drives in the past, both external and internal, but I'm not yet making that decision. I'd like to get some feedback from the group concerning this issue if possible. Any and all opinions will be greatly appreciated. Thank you all.