Hello Yang,
The PXI 8186 controller does not require floppy disks to boot the controller into RT or format the controller.
KnowledgeBase 361AGHJ4 describes the steps necessary to configure your 8186 controller for RT.
If you find later that you need to format the controller, right-click on the remote system (IP address) in MAX and choose to Format Disk.
If you have any further questions, please post a reply.
Regards,
Kristi H
National Instruments