hi guys in this video i will show you how to solve this issue .
Follow the steps :

1. Open a Command Prompt .
2. Type diskpart and press Enter. You can see the command prompt is changed to be DISKPART>
3. List the disks by typing:

   list disk

4. Select the external USB disk by typing (in my example the external disk was disk 2): select disk 2
5. Set the read-only attributes for the disk and volume to be off: attributes disk clear readonly

This disk is write protected