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Why is NoClone a TRUE duplicate file finder?

NoClone uses True Byte-by-Byte Comparison that ensures the duplicate files uncovered are exactly the same in content.

Duplicate File FinderFully compatible with Windows XP, Vista, 7, 8

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 recent research indicated that there is a possibility of collision even for MD5 hashing. Below is an example from http://www.mscs.dal.ca/~selinger/md5collision/:

Here are two files with same MD5 hash value (cdc47d670159eef60916ca03a9d4a007)*.

Windows version: Hello.exe erase.exe

Run them and you will find they got different output as follows:

Therefore, comparing exact content is the only way to ensure accurate result. Compared with finding duplicate by CRC or MD5 hash, NoClone uncovers duplicate with 100% accuracy.

How does True Byte-by-Byte comparison work? Still efficient!

To avoid false duplicate report as a result of MD5 collision, NoClone use the technology of True Byte-by-Byte comparison. With intelligent file filter, a list of suspected duplicate files will be scanned out. With exactly content comparison, duplicate file found is reliable. By opening suspected files together and compare their content respectively, we can find true duplicate files easily.

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1/4/2014 4:30:32 AM modified.