FineWare.com

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Duplicate File Finder Space Hound by Fineware Systems - Find Duplicate Files

Description

Versions of Space Hound prior to version 4 used a technique called CRC ( cyclical redundancy check) to determine if two specific files are equal to each other. A CRC Check is performed by applying a mathematical formula. It is based on the size of a file and the value of each bit within the file.

In the ten years since the product's initial release, there was only one reported instance where two different files, of the same size, computed the same result. This occurred when a user found a set of files that were used with Microsoft's Front Page Web Design Product. After researching this phenomenon, the only answer appeared to be the fact that these files were specifically engineered by Microsoft so that they could be selectively overlaid into Front Page itself without triggering anti-virus defenses that also use CRC checking to detect altered or otherwise dangerous files.

Most Duplicate File Finders on the market today use CRC checking to determine if two files are identical. It is not necessary to perform an extremely time consuming bit by bit comparison against all files which happen to share the same file size.