Unable to format my 4gb pendrive

I have a Twinmos 4 gb pendrive.When i insert it , a window open showing " You need to format the Disk before you can use it". but when i select to format .it says "Windows cant format it.Make sure the disk is not read only" . I am using Windows 8.It doesnt have that Registry Editor " Write Protected". I have tried Dos Command,many software.But i have failed like always.Even It doesnt show in Disk Management.

What should i do?? Please Help me....
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  1. Use this tool. It will fix format problems for you. It won't help if the USB drive is dead.
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