Right now I have a 74GB Raptor drive with OS X and all of my apps. My original 160GB drive is still in there and I am currently using it for backups. The Rapor is filling up fast and I am wondering how feasible it is to have the OS on it and all my apps on the other drive. I have a feeling the best thing to do might be get a nice large capacity drive and go back to a single drive configuration.