i have a mbp i got in may 2010 and am having problems with running photoshop cs5. this is the first time ever running into a full disk warning. the image size is 51mb and iam trying to resize it to 940 to 800 at a resolution of 300. when doing this it says my scratch disk is full and i see my gb available drop form 120gb to 0kb. what the heck is going on? how can resizing a 18 mpx image eat that much disk space?