Mobile Hard Drive Is There A Peripheral That Allows For The Addition Of Another Mobile Hard Drive?

Is there a peripheral that allows for the addition of another mobile hard drive? - mobile hard drive

Recently, I received a new 2.5 "HDD (500GB Seagate 7200/16MB 2.5" SATA HD), and I want to clone my current hard drive to the new (Seagate DiscWizard). My computer is only one hard drive. I do not want to buy an external hard drive. I could not save it on your computer, but I do not draw. Perhaps there are devices?