After a few times that isnt gonna work so well. Once a year at a particular multi day event, I will fill and dump a large CFast2.0 card several times. Using the IN CAMERA format does not do nearly as complete a job as a full format using a full desktop OS. Windows or OSX. When I shoot this event each year, I bring the card reader and my MacBook Pro with an external SSD to dump files between shows and then once dumped, I use the Mac OSX Disk Doctor tool to do a proper format of the card.
What was happening before I learned this was that by the third show (following the second card dump and subsequent formatting inside the DX2) my buffer was starting to clog somewhat as the write speeds were slowing down the camera. By the forth show, my 14fps bursts were becoming more seriously impacted and limited as the DX2 was just seizing up if I was holding down the shutter for multi second bursts (to catch dancers in flight) and i would be dead in the water waiting for 10-20 seconds or more for the buffer to dump i to the card because you can see the buffer counter in the OVF on the DX2 and watch it as you fire. Needless to say the DX2 should not have this problem. Ever. And the first and second shows, it did not. But with each in camera format of that $350 memory card, I was clogging it up more and more. Had I been shooting one or a few frames at a time? Never would notice. But if you are gonna work that shutter like a dog for sports and dance.... you better learn to travel with a computer that can do a proper format. Once I figured that out, I never ever had a problem with cards again.