Here is my dilemma, I want to use a Mac Mini for a dedicated media server. However right now I have two 750gb hard drives, both reasonably full, meaning soon I will have to buy a third external HDD. The Mini has 4 USB ports on the back. Is there a way to plug multiple external HDDs into multiple USB ports and have them act as one huge HDD? The reason I need this is because I plan to keep everything in iTunes and just leave it open/running. In order to do this I have to have one iTunes library and locate it in one place, not four different library folders spread out over four different HDDs. Can someone help me with this, or recommend a better way to do it?