Ok, here's the deal. I can't find an eSata card that works with OSX, Windows, and a 2009 Mac Pro. I need to have eSata capabilities in both Windows 7 and OSX. However, no matter which eSata card I install, Windows will not boot. Just hangs at a black screen. I've gone through 3 cards now. Everything works fine in OSX, but I have some programs that are Windows-only that I am dependent on, and VMWare/Parallels is not an option. So far, I have figured it out to be a problem between the card BIOS and the legacy/emulated BIOS that Apple uses for Windows. That's my best guess. I've used older Mac Pro's like this before, but now I have 10 brand new Mac Pro's that need eSata and still be able to run Windows and OSX. HELP!