|·||by Content: this process takes more time but it is the only way to ensure a file is repeated (or "cloned") in same folder or other folder(s). Using this method you may be surprised found files with different name or repeated across different folders, but are the same file. This may apply for MP3 files, Movies, Documents, etc. Example: you may have the files "C:\MP3s\Top Ten.mp3" and "C:\MP3\American Idol\American Idol's last hit.mp3", both are really the same file (same content) but are repeated across 2 folders: "C:\MP3s" and "C:\MP3s\American Idol". This consumes more disk space and with thousands of files you may loose more time. The analysis by content is based on a hash code, unique for each file based on content. The common hash used is CRC32. It produces an unique "code" for each file, if two or more files have the same CRC32, are the same files no matter file name or location.