I did it before (put an SSD there) but I'm not sure I'm remembering all the steps. Used to be instructions on Macperformanceguide but not there anymore. I removed drive sleds 1 and 2 but the optical drive housing still won't budge. Obviously I don't want to force it. Is there anything else that needs to be unscrewed or removed before sliding out the optical drive housing? BTW, is there anything to be gained by putting a drive on sleds 1-4 over putting it in optical drive bay 2? Any help appreciated.