Pen drive can not format

Hello,



,
When I Format my USB any time messaging that "The disk is write protected"
I already complete your solution of this formula format
1. insert the pendrive
2. dont open or format it directly
3. right click on my computer and go to manage
4.in computer managment window click on disk managment option
5. right click on the removable disk (i,h....)
6. select format
But my USB is not Format. When Formatting is complete 100% again messaging that "The operation did not complete because the media is write protected". How can I format my USB please help me sir