1. Insert the USB drive and open up Disk Utility.
  2. Click on the actual drive name, not the partition/s.
  3. Click Erase.
    1. Select whatever you want the name to be in the name field.
    2. Select MS-DOS (FAT) or ExFAT depending on the Win file system you want.
    3. Select Master Boot Record for the scheme.
  4. Click Erase.
  5. Once done, unmount and try it on your windows machine. Should work.

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