The page shows 4TB supported, but Seagate introduced SATA2 32MB 1.5 TB drives. I can't really seem to find anybody that goes 'yep, I have one of those, works fine'. So before we invest the extra bit of money for the extra bytes of storage, it is worth asking this fun community here on macrumors. I currently have 4 internal drives, 250GB, 320GB, 750GB and 1024GB. And external a bunch of 320/500/1TB, but they won't matter. What I want to do is replace the 250/320 (and move them to external eSATA) and replace them with 2x 1.5 TB seagate drives. Anybody have any experience with these drives, and if so .. do they work just fine with the mac pro? In theory they should support 16 TB because of the 64bit os. but hey .. seeing how the new mbp should support 8gb ram but doesn't. .. It doesn't hurt to ask.