It's been a few years since I looked at it but I think the "HASH Examples in 
4D" tech note includes a sample database that had as a proof of concept the 
ability to "find duplicate files on a hard drive"
http://kb.4d.com/assetid=76130

Tech Note: Hash Examples in 4D
PRODUCT: 4D | VERSION: 12 | PLATFORM: Mac & Win
Published On: July 16, 2010
This Technical Note discusses hash functions including some of their common 
uses; the concept of salt is also discussed. Included with the Technical Note 
is a sample database that demonstrates using hash functions for encrypting 
passwords, file integrity, file fingerprinting, and finding duplicate files on 
a hard drive.


-Tim



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