Today I am going to share a 100% working software which would help you to repair a Pen Drive when windows fails to format the Device.
At First Download this File:h t t p : / / 4 s h a r e d . c o m / f i l e / Q s o b X u d h /
Install the HP Disk Format Utility Which you have downloaded from the above link:Follow the instructions and format the specified Device.