Iomega eGo Helium 500 GB USB 2.0 Portable External Hard Drive 34491 Ultra Thin - Thin and lightweight (.44 lb.) USB 2.0 portable hard drive Stylish - Perfect match for the new MacBook Air notebook (HFS+ format); compact silver design slips easily into a purse or briefcase Rugged- The Drop Guard feature protects the drive when dropped up to 51" (40% above the industry average)! Secure -EMC Retrospect software and MozyHome Online software included for backup (via free download)