  CeRu2 and 2H-NbSe2 display remarkable similarities in their magnetic
response, reflecting the manner in which the weakly pinned flux line lattice
(FLL) loses spatial order in the Peak Effect (PE) regime. The discontinuous
change in screening response near the onset of PE and the history dependence in
it are attributed to a disorder-induced fracturing transition of the FLL, as an
alternative to the scenario involving the appearance of a spatial modulation in
superconducting order parameter in CeRu2.
