predicting performance of sql loading a 400 GB file

I don't have a 400 GB file and I don't have storage space for it to leave a 
file on disk to run the test. If I do some test loads of a 1 GB data file, does 
anyone know if this will scale up linearly? what is the minimum size file I 
should use in order to get some idea of predicting performance of the load? 

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