Unable to remove recovery partition in Surface Pro

So i bought a first generación Surface pro, and after all the firmware and 8.1 updating I want to remover the recovery partición to free space. But when I try to run the USB recovery media tol, It doesnt allow me to copy the partItion (the option is greyed out). Does anybody know why could it happen? Is there any other way to remove it? Can I safely remover the partición manualy?