Microsoft is currently offering a free Seagate FreeAgent Go Portable 500 GB Hard Drive (Black) for customers who purchase Windows 7 Professional Upgrade from the online Microsoft Store.
Note: Limited time offer valid only on eligible products and while supplies last. Shipping available to the 50 United States and D.C. No APO/FPO addresses, PO Boxes, or U.S. Territories.
More Info: Microsoft Store