Yesterday I just did what you will do, I copy my intenal disk (80G) to new disk(500G),because the small free space on the original disk, my assistant told me the fast program easeus partition master V6.5.2 home edition can help me, then i google that,and download it to my PC. Amazing!! VERY FAST! THank god, in addition, it's totally free for my home use. If you want to copy disk, you deserve to have a try. iT'S your choice.
BTY, please tell me whether my suggestion is helpful. :)