HOW TO CLEAN BOOTABLE USB

Open your command prompt and type code as under

1.    From Command prompt type ‘diskpart‘

If window ask for administrator permission than click on YES. 

2.    type list disk

3.    it should then look something like this:

               DISKPART> list disk

               Disk ### Status    Size          Free     Dyn     Gpt

               ——– ————- ——- ——- — —

               Disk 0     Online    465 GB    3072 KB

               Disk 1      Online    7728GB    0 B

           
4. Once we see which Disk is your USB drive, you will want to type ‘select disk‘  (change “disk 1″ to the number of your drive):

        5. DISKPART> select disk 1

               Disk 1 is now the selected disk.

           6. DISKPART> clean

                DiskPart succeeded in cleaning the disk.

        7. DISKPART> create partition primary

               DiskPart succeeded in creating the specified partition.

        8. DISKPART> select partition 1

               Partition 1 is now the selected partition.

        9. DISKPART> active

                DiskPart marked the current partition as active.

      10. DISKPART> format fs=ntfs quick

             100 percent completed

             DiskPart successfully formatted the volume.

      11. DISKPART> assign

             DiskPart successfully assigned the drive letter or mount point.

COMPLETE!