Nighthawk not seeing USB i.e. r7500, r8000, r8500, r9000 etc

USB should be NTFS but it Exfat or Fat etc

Put the USB drive into your computer (In my case win 10) 

Make sure USB drive has some free space

At a command prompt type 

       convert drive_letter: /fs:ntfs 

Example

       convert d: /fs:ntfs