Hi André,
Just to clarify, all dual-boot systems use the same hard drive for both operating systems. The floppy drive is used only for configuration. If you do not have a floppy drive, you can use a USB CD-ROM drive to load the recovery CD that ships with the controller. Please note that using the recovery CD may result in the loss of data from the previous Windows-only configuration. All of the important files should be backed-up prior to any recovery. For a better idea of what specific steps are involved, you can check out the following link:
In particular, the section at the bottom goes through the process of converting to a dual-boot controller.
David H.
Applications Engineer
National Instruments
David H.
Systems Engineer
National Instruments