how to transfer files from usb to usb on mac?
['Plug the USB flash drive directly into an available USB port. NOTE: A No Name or Untitled disk icon will appears on your desktop.', 'Double-click your Macintosh HD (Hard Drive) icon to open it.', 'Select files you want to drag over.', 'Drag files from your Macintosh HD to the Removable Disk.']