To check information related to File system, remaining space, etc of USB drive follow these steps:ġ. Right-click on the USB drive icon on the desktop, if not available, Open a ” Finder” window, then right-click on USB drive located on the sidebar.Ģ. This article is also applicable for other external storage devices like External Hard disk, thus resolving storage device not recognizing on Mac by changing its format. Formatting the USB drive will delete all the files. 1 Before Formatting USB Drive, Do this!īefore you proceed to format USB drive on Mac, you must BACKUP data first.