Virtually all external USB hard drives can be reformatted usinig Linux tools, provided you can find a driver for the drive itself. In modern Ubuntu, this is rarely a problem. KDE is just an interface, so this makes no difference whatsoever.
Included software on these drives is, of course, Windows only, so the reformatting would have to start outside of you Operating System, perhaps using the Linux Live feature of the install CD or ISO burn. You would have to use backup routines or applications specific to Linux for best results.
I see no hardware or firmware reason why a reasonably modern Linux distro should not be compatible with these drives, once they are reformatted from a Live CD or Linux bootable disk tools CD.