"binary diff" utility

Wojciech Puchar wojtek at wojtek.tensor.gdynia.pl
Fri Jun 29 15:53:27 UTC 2012

i have many windows images running over virtualbox. each takes several 
gigabytes. i use flat image format.

each differs by very little.

Is there any program that can do "diff" and keep just a difference between 
each of them instead copy of whole VM disk??

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