Comment on \char16Jamming at zero temperature and zero applied stress: The epitome of disorder\char17

O’Hern; Silbert; Liu; and Nagel [Phys. Rev. E. 68 ; 011306 (2003)] claim that a special point J of a “jamming phase diagram” (in density; temperature; stress space) is related to random close packing of hard spheres and that it represents; for their suggested definitions of jammed and random; the recently introduced maximally random jammed state. We point out several difficulties with their definitions and question some of their claims. Furthermore; we discuss the connections between their algorithm and other hard-sphere packing algorithms in the literature.