I just bought a mid 2011 iMac 27" on ebay. Want to know a few things: 1. Can I open it up to replace the HD? 2. Is there 1 thunderbolt to multiple firewire connectors? I have 3 firewire devices connected to my current Mac Pro which I will sell. I also need the additional thunderbolt ports for my huge sound drives (I do music). I'd appreciate your help!