From the manual I did not get the impression that dual record was a feature at all. One can specify which card is the first to start and then go to the other when full or let the camera decide which is the fullest to start. The SD electronics are associated with the USB-C connector so if there is a USB drive attached the SD slot is unavailable. However I still did not see anything in the manual about recording to USB drive and the CFast at the same time. Can you give me the page reference for that?
