Attached Link: FAT sizes: FAT-12, FAT-16, FAT-32

@neverfinder Some products that accept CF devices are not able to use all of the capacity. You may be aware that some of the older PC motherboards are limited as to the size of the HDD that may be attached. Some cameras have equivalent limitations. Another concern is the type of file system that can be supported. The possible Microsoft file systems include FAT-12, FAT-16, FAT-32, HFPS, NTFS. For each of these file systems, there is a maximum size HDD that could be supported. FAT-12: Maximum number of clusters: 4086 Cluster size: 512 bytes to 4096 bytes Maximum Volume Size: 16,736,256 FAT-16: Maximum number of clusters: 65,526 Cluster size: 2048 bytes to 32,768 bytes Maximum Volume Size: 2,147,123,200 (~2GB) FAT-32: Maximum number of clusters: ~268,435,456 Cluster size: 4096 bytes to 32,768 bytes Maximum Volume Size: about 2^41 bytes ... and, yes a CF device is formatted with a file system. Mount a CF device in a CF reader; open Windows Explorer; right-click that drive letter and choose "Properties". You may have heard that you must always format a CF in the camera NOT on the PC -- That's because the software on the PC might format the CF device with a file system that the camera's software cannot process. MGD