I have a July 2007 MB with 80GB. I am going to swap it with my 2.5" external HDD taken out of its enclosure. It is 160GB. How do I swap these two disks while still somehow keeping my music, photos, and backups (from the external)? I have Leopard, and the external is my Time Machine disk. I only have the Tiger restore discs, and am without my Leopard family pack install disc. How do I pull this off?