At the moment I am running my cMP with 512GB HD and 16Bb of RAM with Photoshop CS5. About 50Gb on the internal HD and 500Gb on a 3TB optical drive. The internal used for mostly images I am working on and obviously the rest on the external. The scratch is also on the internal on its own section(forgotten the right name). I am planning to add a Samsung 1TB EVO in a single drive case via Thunderbolt. What would be my best set up?? Just for the CS5 really no other assessment needed. I shall be deleting a fair bit of rubbish before transferring to the sad so maybe just 450GB in total. All suggestions appreciated Regards Sharkey ps: other options also appreciated.