HI
I JUST WANT TO TELL U THIS PROBLEM IS CREATED BY TROJAN DOWNLOADER VIRUS THIS COULD NOT BE REMOVED FROM ANY ANTIVIRUS WHEN IT IS ACTIVE AND WRITE PROTECTED  , THIS VIRUS IS CLEANED BY MICROSOFT SECURITY ESSENTIAL SOMETIMES.

TO FORMAT YOUR PENDRIVE USB, MEMORY CARD OR AN I-POD .
YOU HAVE TO DOWNLOAD UTILITY SOFTWARE CLICK HERE TO DOWNLOAD.

ANOTHER LINK: CLICK HERE

Or

Is your computer prompting 'Write Protected' when your trying  to format your pen drive.
Here comes the cool trick to format easily-


1.Download this application here.
2.Install the application in your PC.
3.Open the application and select the drive to fix the problem
eg-If the  Removable disk F has the problem choose accordingly.
4.Then click format.


THIS IS LOW LEVEL FORMAT TOOL . I USED IT IS 100% WORKING .

THANK YOU