Using USBC-C connection the included USB C-C cable to 3 USB-C or Thunderbolt 3 port on the computer, Using USB C-A + Connect the Included USB C-A cable to a USB /20 port on the computer. ‘The drive is per-formatted as ex Fat, which Is compatible with Windows and Mac OS. For users who wish to reformat the drive, please visit the links for instructions. To reformat using Windows: com/windows reformat htm! To reformat using MAC OS: prestidigitation com/mac reformat.