[other_os] Dual boot with Windows 7 question

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http://ubuntuforums.org – Hello, I want to install Ubuntu along Windows 7 and I was told not to choose dual boot because of the fragmentation of Windows. My computer is fairly new and doesn't have many files. If I were to defragment the computer and give ubuntu 5gb of space using the dual boot option, could I extend the Ubuntu partition later? (Windows says I can shrink the drive down to 436.5gb out of 911gb.) (Hardware)