[ubuntu] Unmounting HDD (Internal)

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http://ubuntuforums.org – Right so i have my partition and i wanted to format it so that i can reinstall my windows vista i try to use GPARTED to unnmount it but it says could not unmount partition /dev/sda1 because of mount points / (root), next step i researched how to manually unmount and found by using terminal commands such as sudo umount /dev/sda1 it requires password i enter that in and it says umount: /: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) any help will be appreciated (Hardware)