  This paper argues that the weak cosmic censorship hypothesis implies that the
Schwarzschild black hole has maximal entropy in all stationary black holes of
fixing temperature, or equivalently, to store a same amount of information the
Schwarzschild black hole has highest temperature. It then gives the independent
mathematical proofs for 4-dimensional general static black holes and
stationary-axisymmetric black holes which have "$t$-$\phi$" reflection
isometry. This result does not only provide a new universal bound between
temperature and entropy of black holes but also offers us new evidence to
support the weak cosmic censorship hypothesis.
