I wanted to share this.
I am using the Lexar Professional 800x 16GB UDMA7 Compact Flash card in my AmigaOne X1000. Under Ubuntu Linux Gparted; this card requires MBR Partition Table and the full 16GB formatted as 1 MS-DOS (FAT32) partition in order to work correctly. I am successfully using it for downloading/unpacking/booting Kernels and I am able to save files on it. As long as it remains this way, it can also be utilized as an MS-DOS storage device in AOS as well. Just do not use Media Toolbox and "Install". Basically a non-removable FAT32 media device. I hope this is good news for those who have had issues with CF Cards 16GB or greater and wondered how to utilize their full potential.
Side note: I did not "Label" the CF Card in Gparted but sticking to MS-DOS rule, I was able to Rename it under AOS using all CAPS and min. characters.

Cheers!
John