how can i remove write protection from usb
you can always protect read write on your USB, you can consider this http://thedijje.blogspot.in/2012/10/protect-USB-read-write.html
if you seems USB is write protected,
you can copy and paste this code in notepad file, save as .reg extension and save as full permission.
backup your registry and after this Run the reg file you have created.
after this plug in your USB and right click on it, you will see option grant full admin permission. click on it and you're done.