I want to put 3 partitions on my comp. 1)Windows 7 2)Ubuntu 3)Storage. Can Gparted do this in one edit? How much do you think my W7 and Ubuntu partitions should be? And can I do this since Windows 7 and a whole bunch of programs are already installed?
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Yes Gparted can edit your partitions even if they have data on it.
Well, this depends on many things. For ubuntu a 8GB partition is more than enough for the instalation.
Parition Size? 
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Linear Mode
