It should be options, security, then you should have memory cleaning. But I have a 8130. I don't know if the 8100 has it or not. What os are you running? I had 4.3 os an mine and it was there. I just up graded to a beta 4.5 yesterday and still have it. I belive there is a official 4.5 for the 8100 and I would assume that that os would have it. I could be wrong though.