I have used an optical caddy to fit a SSD into my macbook pro along with the existing 500GB hard drive. My next ambition is to fit 2 hard drives and a SSD inside the macbook pro. My questions are: 1) Can I use a Sata port doubler (Do they exist?) to run 2 hard drives through one sata port. (The bandwidth is there) 2) Failing the above can I use a cable linking a sata drive to the airport express slot? (is it PCI express?) Thanks in advance and I really do appreciate any time spent helping me.