Seagate Slim 500GB Portable Hard Drive for Mac USB 3.0 (STCF500400) Ultra-thin portable hard drive, perfect for on-the-go with ultra-fast USB 3.0 Formatted for Mac out of the box and instantly compatible with Time Machine software Save feature enables user-generated content to be backed up from your favorite social network Share feature allows multiple files to be uploaded to social networks at once from your computer Ultra-thin portable hard drive, perfect for on-the-go with ultra-fast USB 3.0 Formatted for Mac out of the box and instantly compatible with Time Machine software Save feature enables user-generated content to be backed up from your favorite social network Share feature allows multiple files to be uploaded to social networks at once from your computer Install the downloadable HFS+ driver for PC and use the drive interchangeably between Mac's and PC's without formatting