You can also make you of GNU split utility to split the 4GB into separate 100MB file and compress 100MB individually using 7zip, for more details of making use of GNU split you can refer
http://mykeystrokes.blogspot.com/2009/04/spliting-files-gnu-way.html -- http://mykeystrokes.blogspot.com http://twitter.com/akber_ join me here I mailed you with 10KB/s connection what about you?
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