WD 1.5TB WD Elements Portable USB 3.0 Hard Drive Storage (WDBU6Y0015BBK-NESN) (Certified Refurbished) This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 6-month warranty Interface: Super-Speed USB 3.0 Format: NTFS Windows 8 or higher, Windows 7, Windows Vista, or Windows XP Mac OS X 10.4.8 or later (requires reformatting)