  The thermodynamic properties of Cauchy horizon is a matter of interest. Event
horizon and Cauchy horizon together can enlighten us about the micro-states of
a black hole. In addition, if we consider a black hole metric modified with
quantum terms, which is not forcing the geodesics to focus at a singularity,
the study of horizons becomes much more interesting. The spacelike behavior
inside the Cauchy horizon has a deep impact on the related thermodynamics. We
analyze different thermodynamic product to check whether a right left string
theory mode's addition type representation for the concerned thermodynamic
parameters is possible or not. Stability of Cauchy horizon is studied.
