  $\Lambda$CDM numerical simulations predict that the "missing baryons" reside
in a Warm-Hot gas phase in the over-dense cosmic filaments. However, there are
now several theoretical and observational arguments that support the fact that
galactic disks may be more massive than usually thought, containing a
substantial fraction of the "missing baryons". Hereafter, we present new N-body
simulations of galactic disks, where the gas content has been multiplied by a
factor 5. The stability of the disk is ensured by assuming that the ISM is
composed out of two partially coupled phases, a warm phase, corresponding the
observed CO and HI gas and a cold collisionless phase corresponding to the
unseen baryons.
