I agree, on a system being built for dual boot, using the
Gpartd live CD allows the view of the visual presentation of the disk
better than the partition manager of the Ubuntu live CD's, while I do
believe it also is Gpartd although in different form. Once a disk is set up
for dual boot with the windows partition, recovery, reduced and the
Linux partitions set in size and either formated or not, then the Ubuntu
live CD booted, you still will need to go through the partitioning of
the Ubuntu CD and format or not your choice. Once all is set on future
loads you will or should recognise the layouts and disk partitions of
the root file system and the /home and leave it unformated.
I think the built in partition manager on the Ubuntu live CD could be
bothersome to do a dual boot system even after I have done one or
two.