Use a program like Seagates Diskwizard to clone the 80GB OS to the 500GB partition you want the OS on. You will use the custom partition settings. No matter what you have heard, it doesn't matter if you have Seagate drives or not. DiskWizard will work with any drive. You will just get a warning that Seagate will not give you tech support unless you are using Seagate drives. All the functions will work