My first thinking is that you need to be superuser.
I'm unfamiliar with this operating system, but it sounds like the point of it is to enable these types of features, and therefore one would think that they'd take care of privileges as part of all that instead of leaving you unawares.
I don't recommend using a GUI to perform some of the advanced such as this, and you don't need to do that for dd.
Code:
sudo dd if=<source drive or partition> of=<target drive or partition>
As an example, say I wanted to copy an entire disk, my original disk has maybe two partitions, and it gets mounted as /dev/sdf1 and /dev/sdf2, but I want an entire disk copy. My target disk gets mounted as /dev/sdg1. Well, I'd invoke dd from the command line the following way:
Code:
sudo dd if=/dev/sdf of=/dev/sdg
I know people use the bs= part of the command, but honestly I've never been bitten by not using that option.
I repeat, don't use a GUI based tool to perform this type of operation. Just my opinion there.