I've just bought a 1st gen Mac Pro (1,1 A1186) and fully tested it - everything OK. I then proceeded to put in 3 new SATA drives into the empty bays - 2 x 1TB and 1 x 2TB - making 4.25TB in total. I'm now getting various sorts of weird behaviour - slow booting & shutting down, certain volumes disappearing and reappearing in the finder, and even full-blast fans and flashing power light. The 2TB drive is partitioned into 3 volumes, and this is the one that seems to be giving all the problems. I now understand that Apple stated a 2TB total limit on these machines on launch. Is there any way around this?