NoClone - TRUE Duplicate File Finder
NoClone is a powerful file management utility to find out and remove duplicate MP3, duplicate photos or other duplicate files. Besides saving valuable local hard disk space, removing duplicates will also help to manage file well, speed up file indexing.
Why is NoClone a
duplicate file finder?
By True Byte-to-Byte Comparison
,NoClone finds out the TURE duplicate files which are exactly the same in content, instead of FALSE duplicate files.
Why is CRC or MD5 not reliable?
Comparing file content by CRC or MD5 is a common practice of uncovering duplicate files. However the collision rate of CRC is not satisfactory and some research indicated that there is a possibility of collision even for MD5 hashing. Here is an example from http://www.mscs.dal.ca/~selinger/md5collision/:
Here are two files with same MD5 hash value (cdc47d670159eef60916ca03a9d4a007)*,which are judged as duplicate files by MD5 comparison.
Run them and you will
find they got different output as follows:
Therefore, by CRC or MD5 comparison, it can’t be a TRUE duplicate file finder. Comparing exact content is the only way to ensure 100% duplicates and NoClone has realized that.