Help me to format my USB disk

i have a 512meg Joger falsh disk that i can not format it! i use a software named "HP USB Disk Storage Format Tool" but when i want to format it i recive a error "the disk is write protected" even i can not format it via win XP SP2!! please help me! i cant delete files or copy a file in it!! i used kill disk also but nothing happend! :(
 
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