HOW TO FORMAT WRITE PROTECTED PENDRIVE

1. Open up a command prompt. 
2. Type “diskpart” and press enter. 
3. At the “DISKPART >” prompt, type “list volume”. 
4. This will show you a list of your drives and a corresponding number. 
5. Assuming your flash drive is listed as “5″, type “select volume 5″. 
6. Then type “attributes volume clear readonly” and press enter.

That will remove the “readonly” setting from the flash drive’s volume. Hopefully it helps. “

OTHER WAY

Neo 9 tool able to get past the write protection and format the pen drive

http://www.box.net/shared/9hgp81ndgs

or

1.Go to Run->regedit
2.MyComputer->HKEY_LOCAL_MACHINE->SYSTEM->CurrentControlSet->Control -> StorageDevicePolicies
3.Delete the StorageDevicePolicies in Your Registry.