In case you want a tool for finding your duplicate files you should give a try to Duplicate Files Searcher. Is a Java based program and is very powerfull and accurate at the results. It uses byte per byte and hashes SH1 and MD5 and can be used in every OS as long as you have installed Java Runtime Environment. You can download from: http://duplicatefilessearcher.net/ http://sourceforge.net/projects/dfr/ Panagiotis ps. for windows users: pay attention to not add entire drives in the search because it will get stack at the "system volume information" folder.