The bounding point and not so important. Could instead of every tick data have as choosing M1, export. FXT
I used CSV2FXT and file size generated was 2 gb and little by tickstory went from 5 gb with the same date of 04/2007 will be 11/2012.
Carioca
I downloaded from here must have been some error when downloading
http://www.dukascopy.com/swiss/english/marketwatch/historical/