Western Digital 2.5″ 500GB SATA Hard Drive & USB 2.0 Enclosure for $89.99 shipped after applying code EMCHDD10. Note that the WD 2.5″ SATA hard drive comes in OEM packaging, which means no pretty retail box and marketing materials but is otherwise identical. Combining the 2.5″ hard drive with the external 2.5″ USB 2.0 enclosure would make a portable 500GB external drive that is small, lightweight, and does not require an external power supply for better portability and convenience.