In this report, we compare the characteristics of nanostructures on graphite surfaces produced by oxidation processes at high temperatures and by an electric pulse method using STM. The craters generated by the oxidation process are typically flat bottomed, indicating uniform atomic layer removals, while the electric pulse method will lead to V-shaped craters that could be associated with the electron diffusion characteristics. The studies of the fabrication experiment on a 1TTaS2 surface using STM yielded appreciably different results. It is observed that the threshold pulse voltage is lower than that for graphite at comparable tunneling conditions. The minimum dimension of the as-produced features is appreciably larger than those on graphite. Both observations indicate higher surface instability for 1TTaS2 as compared with graphite.