Hello, I am just beginning to use arcMap. While using the field calculator for a simple deforestation calculation - after first creating a road buffer and deforested area "clip", I get an error message that file already exists from previous successful calculations. I read that navigating to geoprocessing "options" and enabling "overwrite the outputs of geoprocessing operations" should do the trick. Unfortunatley, that doesn't work. Does anyone have any suggestions for how I can possibly rename files, or organize them to avoid having duplicate files with the same name? Thanks - lsanagy