Are you using the latest gparted ISO? Anyways even you use gparted or any other partition manager tool whether Windows app or whatever I would make a backup of important data. You could have a power failure, power glitch, blow a power supply in the middle of the process and loss it all. Just worst case.
Distribution: RHEL 5.1 with Pieces of this and that.
Kernel 22.214.171.124, KDE 3.5.8 and KDE 4.0 beta, Plus Development src.rpm, ATI fglrx64_7_1_0-8.433-1 rpm with 3D and DRI working.
Acer 5100-5840 with webcam, ati, sdcard reader, sound, atheros based wireless, all working. Only thing not working is the memory stick reader.