How to Repair a Corrupted Flash Drive using CMD (Command Prompt)

Go to Start and find CMD right click on cmd and Run as Administrator

then you will see this

Instructions

• Plug your flash drive into an empty USB port on your computer.
• Click “Start,” “All Programs,” “Accessories” and “Command Prompt” to open the DOS command prompt window.
• Type “diskpart” after the command prompt to start the Disk Partition utility. This should result in a DISKPART command prompt.
• Type each of the following commands, one at a time, after the DISKPART prompt, pressing “Enter” after each:
  list disk
  select disk #
  clean
  create partition primary
  select partition1
  active
  format FS=NTFS
  assign
  exit
• 5 Close the command prompt window. Your USB drive is now formatted.