Hi. My mac can not recognise its hard disk drive. I want to buy a new one. But I am not sure if it can support 320G hdd. My model is Macbook Mid 2007 with tiger preinstalled. Its original hdd is 80G. core 2 duo 2.0 boost to 2g memory GMA 950 display card the apple technical support said the capacity should be limited to 200G but without giving me a reason? please give a comment.