Swapping drives

Recently, I added a second harddrive to my Mac Pro. As it happens, it is larger than the primary harddrive.

What I would like to do is use the larger harddrive as my Mac OS disk, while using boot camp to set the smaller one up with windows.

Question: when I set up the larger one with 10.6, do I have to use the install disks, or can I just copy all of the files from the old disk to the new? Are there any hidden files that I need that might get left behind?