  The role of rescattering due to the final state interaction (FSI) and the
influence of the finite formation time (FFT) on the inclusive $D(e,e')X$ and
exclusive $D(e,e'p)n$ electro-disintegration of the deuteron are studied in the
cumulative kinematical region $x>1$ and moderate values of the 4-momentum
transfer $Q^2=2\div 10$ (GeV/c)$^2$. The spins are averaged out. It is found
that in the inclusive process the relative magnitude of rescattering steadily
grows with $x$ and that at $x=1.7$ it has the same order as the plane wave
impulse approximation (PWIA) contribution, with the finite formation time
effects decreasing the rescattering contribution by $\sim 30$%. In the
exclusive process, with increasing momentum transfer, FFT substantially reduces
the effects from FSI, although the latter are still appreciable in the region
of momentum transfer investigated.
