We consider the consequences of keeping the total surface fixed for a polydisperse system of $N$ hard spheres. In contrast with a similar model (J. Zhang { \it et al.}, J. Chem. Phys. { \bf 110}, 5318 (1999)), the Percus-Yevick and Mansoori equations of state work very well and do not show a breakdown. For high pressures Monte Carlo simulation we show three mechanically stable polydisperse crystals with either a unimodal or bimodal particle-size distributions.
Categories: cond-mat.soft