Nirsofts 'hashmyfiles' has this functionality built in already, known as duplicate search mode. Works extremely well. http://www.nirsoft.net/utils/hash_my_files

Nirsofts 'hashmyfiles' has this functionality built in already, known as duplicate search mode. Works extremely well. http://www.nirsoft.net/utils/hash_my_files.html http://www.nirsoft.net/utils/hash_my_files.html