My Mac Pro had the single 320gb drive that came with it. To improve performance, particularly with programs like Photoshop, I'm adding a second drive for data. Which folders should be moved to the new data drive, and which should remain on the boot drive ? For example, the root of my Macintosh HD has: Applications Library Users (which includes subfolders: MyName and Shared) System Is it reasonable to simply move the entire MyName folder to the data drive , and leave everything else on the Boot/Apps drive ? Just drag it to the new drive? Any tricks or tips I should consider ?