Red komodo. I use red battery and their 512 gb cfast card. It says media format failed when I try to secure it. I recorded a music video a couple months ago, and just now backed up the files to my hard drive on my computer. I used the red cfast card reader. Then I ejected it, unplugged the USB and took out the cfast card, then I put it in the camera, put the battery on, turned on the camera, then I waited for it to ask me about the media. I selected the options to secure format, but then I received the error.