Hi, My macbook's internal HD is broken. I went to the geniuses at the Mac Store and teh best they said I could hope for would be for a data recovery service to deal with it. He suggested that I take out the HD and send it off, and in the mean time install OSX on one of my external HD's. I have two and so far I have failed to get it to work. I have a 120G WD passport connected via usb: and a Lacie 1TB HD connected either by USB or Firewire: I'm in the opening screen of the OS, with the OS DVD in the laptop and the HD's plugged in. When I go to select the drive that the OS should be installed on it says that OS cannot be installed on these drives. I'm sure I must have to format it in some particular way or something, but does anyone have any advice for me. How can I get this to work? Thanks so much in advance.